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DR#
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Date of Occurrence
GPS
Week/Day(s)
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Documents
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1
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W1321 D4 (5/5/2005)
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DR 1 ZLA C&V Failure.pdf
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2
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W1321 D6 (5/7/2005)
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DR 2 type 6.pdf
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3
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W1322 D0 (5/8/2005)
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DR 3 Iono Storm May 8 2005.pdf
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4
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W1322 D1 (5/9/2005)
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DR 4 SV 2 outage May 9 2005.pdf
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5
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W1322 D2 (5/10/2005)
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DR 5 SV 6 outage May 10 2005.pdf
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6
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W1323 D0 (5/15/2005)
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DR 6 SV 27 DNU update.pdf
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7
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W1326 D0 (6/5/2005)
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DR 7 - IGP 95W40N.pdf
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8
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W1327 D(s)0,1 (6/12,13/2005)
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DR 8 Iono Storm June 12 2005.pdf
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9
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W1328 D2 (6/21/2005)
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DR 9 TTA failure and type 6.pdf
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10
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W1329 D0 (6/26/2005)
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DR 10 POR SIS
Outage.pdf
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11
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W1330 D0 (7/3/2005)
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DR 11 two IGPs in storm state.pdf
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12
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W1330 D6 (7/9/2005)
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DR 12 UPM trip at Juneau causes NPA outage in the POR
service area.pdf
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13
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N/A
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14
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W1334 D1 (8/1/2005)
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DR 14 Availability loss due to UDRE increase in PRN 14.pdf
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15
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W1336 D0 (8/14/2005)
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DR 15 garbled message - not monitored .pdf
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16
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W1338 D0 (8/28/2005)
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DR 16 POR service outage after GUS switch.pdf
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17
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W1338 D3 (8/31/2005)
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DR 17 WAAS service outage after GUS switch.pdf
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18
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W1340 D1 (9/12/2005)
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DR 18 Miami Thread 3 WAAS G2 Receiver (CRR) sending WAAS
navigation message with incorrect time received.pdf
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19
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W1338 D1 (8/29/2005)
W1338 D4 (9/1/2005)
W1339 D1 (9/5/2005)
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DR 19 Inaccurate GPS satellite measurements from Houston
and Chicago G2 rcvrs.pdf
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20
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W1341 D1 (9/19/2005)
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DR 20 - SIS Outage OD race condition.pdf
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21
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N/A
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22
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W1351 D6 (12/3/2005)
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DR 22 POR Message Gaps caused TTA Monitor Trip & Loss
of PA&NPA Service.pdf
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23
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W1351 D4 (12/1/2005)
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DR 23 High numbers of SV alerts in both AORW and POR.pdf
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24
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W1359 D1 (1/23/2006)
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DR 24 Multiple POR Geo gaps after 2 POR GUS
switchovers.pdf
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25
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W1363 D3 (2/22/2006)
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DR 25 Extended POR
Signal-in-Space Outage after Communication failure.pdf
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26
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W1362 D4 (2/16/2006)
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DR 26 Near-Simultaneous GUS Failures Caused AOR-W SIS
Outage.pdf
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27
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W1376 D0 (5/23/2006)
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DR 27 IGPs around Hawaii set to Do Not Use.pdf
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28
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W1364 D5 (3/3/2006)
W1365 D(s)0,1,2
(3/5,6,7/2006)
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DR 28 ZDC C&V Faulted Repeatedly.pdf
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29
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W1360 D4 (2/2/2006)
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DR 29 Localized Loss of Availability Over Central
CONUS.pdf
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30
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W1361 D4 (2/9/2006)
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DR 30 Loss of Availability due to Satellite Maintenance,
SV 5 (NANU 2006013).pdf
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31
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W1365 D6 (3/11/2006)
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DR 31 Loss of Availability due to Extended Satellite
Maintenance on SV 30 (NANU 2006020).pdf
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32
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W1367 D3 (3/22/2006)
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DR 32 Loss of Availability Due to Extended Signal-in-Space
(SIS) Outage.pdf
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33
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W1376 D5 (5/26/2006)
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DR 33 Loss of Service, SV 13, NANU 2006047.pdf
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34
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W1377 D2 (5/30/2006)
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DR 34 Clarksburg GUS Failure.pdf
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35
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W1376 D4 (5/25/2006)
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DR 35 Extended AORW Signal-in-Space Outage after equipment
failure.pdf
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36
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W1379 D6 (6/17/2006)
W1380 D(s)0-1 (6/18-19/2006)
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DR 36 AORW SNR Drops.pdf
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37
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W1380 D6 (6/24/2006)
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DR 37 C&V failure at ZDC and ZLA.pdf
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38
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W1383 D0 (7/9/2006)
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DR 38 False RDM & UPM monitor at ZDC C&V.pdf
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39
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W1369 D1 (10/9/2006)
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DR 39 AOR-W switchover and extended SIS outage.pdf
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40
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W1400 D0 (11/5/2006)
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DR 40 Type 0 Messages After C&V Faults.pdf
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41
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W1398 D4 (10/26/2006)
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DR 41 WAAS Ionospheric Grid Points (IGP) set to Do Not
Use.pdf
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42
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W1400 D(s)2-6
(11/7-12/2006)
W1401 D1 (11/13/2006)
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DR 42 - SV 5 outage, NANU
2006145.pdf
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43
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W1403 D3 (11/29/2006)
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DR 43 Switchover followed by Signal-in-Space (SIS) outage
in CRW.pdf
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44
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W1404 D0 (12/3/2006)
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DR 44 Signal-in-Space (SIS) outage in CRW.pdf
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45
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W1403 D5 (12/1/2006)
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DR 45 AOR-W switchover and extended SIS outage.pdf
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46
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W1404 D1 (12/4/2006)
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DR 46 4 seconds initialization in AORW, POR and CRW.pdf
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47
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W1399 D0 (10/29/2006)
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DR 47 Iono Scintillation at Fairbanks.pdf
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48
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W1412 D5 (2/2/2007)
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DR 48 CRW Switchover and Extended SIS Outage.pdf
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49
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W1416 D3 (2/28/2007)
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DR 49 GUS Switchover in CRW caused by Serial Port and
M&C Communication failure.pdf
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50
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W1408 D3 (1/3/2007)
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DR 50 Loss of Northwest coverage due to 3 satellites being
set to Not Monitored.pdf
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51
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W1419 D6 (3/24/2007)
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DR51 Loss of LPV service area in Alaska due to IGP GIVE
set to 15.pdf
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52
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W1420 D5 (3/30/2007)
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DR 52 Ionospheric Scintillation caused High Position
Errors at Fairbanks.pdf
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53
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W1419 D6 (3/24/2007)
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DR 53 Iono Scintillation at Juneau.pdf
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54
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W1421 D0 (4/1/2007)
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DR 54 POR SV Alert Did Not Change UDREI's.pdf
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55
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W1422 D2-3 (4/10-11/2007)
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DR 55 GPS satellite PRN 18 anomaly affecting SPS
performance.pdf
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56
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W1421 D4 – W1425 D5
(4/5/2007
– 5/4/2007)
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DR 56 Loss of 100 percent WAAS availability in southwest
CONUS region.pdf
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57
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W1424 D4 (4/26/2007)
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DR 57 Inconsistent satellite tracking of PRN 25 at non-G2
WAAS receivers following NANU 2007060.pdf
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58
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W1426 D3 (5/9/2007)
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DR 58 Communication fault caused selected C&V source switch
on CRW GUS.pdf
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59
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W1430 D6 (6/9/2007)
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DR 59 POR GEO pointing error caused SIS degradation and
outage.pdf
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60
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W1432 D4 (6/21/2007
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DR 60 ZDC C&V fault followed by GEO initialization.pdf
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61
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W1433 D4 (6/28/2007)
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DR 61 ZDC C&V fault followed by GEO initialization.pdf
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62
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W1421 D1 (4/2/2007)
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DR 62 Ionospheric scintillation that caused high errors
and alarm condition.pdf (Report is pending)
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63
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W1438 D2 (7/31/2007)
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DR 63 WAAS set all satellite and IGP's to Not
Monitored.pdf (Report is pending)
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64
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W1458 D3 (12/19/2007)
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DR 64 SV PRN 27 Unexpectedly Set to Not Monitored.pdf (Report is pending)
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65
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W1448 D1 (10/8/2007)
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DR 65 Three Unforcasted GPS Satellite Outages Caused
Reduced Ranging Availability.pdf
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66
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W1448 D1 – W1448 D3
(10/8/2007
to 10/10/2007)
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DR 66 WAAS Observations of GPS AEP Upload to IIRM
Satellites.pdf
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67
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W1468 D4 (2/28/2008)
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DR 67 GIVE Monitor Trips Set IGPs to Storm State in Alaska
Region.pdf
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68
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W1473 D3 (4/2/2008)
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DR 68 Satellite Outages Caused Loss of Availability in
CONUS Region.pdf
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69
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W1467 D0 (2/17/08)
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DR 69 Alaska
Communications Outage Caused Loss of Alaska LPV Service.pdf (Report is pending)
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70
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W1470 D3 (3/12/08)
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DR 70 Selected C&V Source Switch Followed By Geo
Initialization Caused Loss of LPV and NPA Service.pdf
(Report is
pending)
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71
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W1472 D5
(3/28/08)
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DR 71 Inconsistent Tracking of SV PRN 10 Following NANU
2008036 Caused Elevated UDRE's.pdf (Report is
pending)
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72
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W1483 D0 - W1483 D1
(6/8/08
to 6/9/08)
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DR 72 Loss of Availability in Alaska Due to Satellite
Maintenance.pdf (Report is pending)
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73
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W1494 D6 (8/30/08)
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DR 73 CRW High L5 C_N0 and GUS Switchovers.pdf (Report is pending)
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74
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W1495 D0 (8/31/08)
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DR 74 CRW 32 min SIS Outage.pdf (Report is pending)
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75
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W1498 D6 (9/27/08)
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DR 75 C&V Initialization Caused WAAS Service
Outage.pdf
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76
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W1500 D1 - W1500 D1
(10/5/08) - (10/6/08)
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DR 76 False trip on PRN 24 with minimal effect on WAAS
Coverage.pdf
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77
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W1503 D3 - W1509 D9
(10/5/08) - (10/6/08)
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DR 77 CRW Downlink Frequency Spikes Caused Reduced PA
Ranging Availability.pdf
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78
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W1525 D0 (3/29/09)
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DR 78 False WAAS satellite alert for PRN 29.pdf
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79
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W515 D6 (1/24/09)
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DR 79 Doppler Spike caused CRW Signal In Space Outage.pdf
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80
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W1520 D5 (2/27/09)
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DR 80 Ionospheric Scintillation caused High Position Error
at Fairbanks and Kotzebue.pdf
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81
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W1532 D4 (5/21/09)
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DR 81 CRW Type 6 Message set Mutiple Satellites to NM.pdf
(Report is pending)
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82
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W1544 D1 (8/13/09)
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DR 82 ZDC CNV Faults Upon Receipt of QWE Garbled
Message.pdf
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83
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W1544D2 – W1545D6
(8/11/09 – 8/22/09)
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DR 83 ZTL Bad Orbit Determination for PRN135.pdf
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84
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W1549D4 – W1549D5
(9/17/09 – 9/18/09)
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DR 84 Reduced Precision Approach GEO Ranging Caused WAAS
Coverage Loss.pdf
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85
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W1549D5 (9/18/09)
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DR 85 PRN 23 NANU Affects WAAS Coverage.pdf
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86
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W1542 D0 – W1543 D5
(7/26/09) – (8/7/09)
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DR 86 SVN 54 PRN 18 Signal Distortion.pdf
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87
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W1553D5 – W1555D1
(10/16/09 – 10/26/09)
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DR 87 PRN 8 NANU Affects WAAS Coverage.pdf
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88
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W1531D1 (5/11/09)
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DR 88 Effect of CRW UDREi changes on Alaska LPV200
Coverage.pdf
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