GPS may be unreliable or unavailable within the Mashhad TMA, potentially causing erroneous EGPWS/GPWS indications and map shifting.

A1662/26

EST

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NavNavigation Aid Status

2026-07-29 05:25 - 2026-10-27 20:30

Duration:LONG4 months EST

Period of Applicability

2026-07-29 05:25 - 2026-10-27 20:30

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Interpretation

GPS is unreliable and may be unavailable within the lateral limits of the Mashhad TMA from ground level to FL245. EGPWS/GPWS may display erroneous indications and map shifting; pilots must report degraded GPS operation or loss of service as soon as possible.

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Raw NOTAM

A1662/26 NOTAMR A0891/26
Q)OIIX/QGAAU/I/NBO/A/000/245/
A)OIMM B)2607290525 C)2610272030EST
E)GPS UNREL AND MAY BE UNAVAILABLE WI AREA WITH
THE LATERAL LIMITS OF MASHHAD TMA AS SPECIFIED IN IRAN AIP,
FM GND UP TO FL245,
EGPWS/GPWS MAY DISPLAY ERRONEOUS INDICATION AND MAP SHIFTING,
AS REPORTED FREQUENTLY,
PILOTS SHALL REPORT GPS ANOMALIES INCLUDING DEGRADED OPERATION
AND/OR LOSS OF SER, ASAP.
F)GND            G)FL245

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