GPS may be unreliable within the Tehran TMA, with potential EGPWS/GPWS erroneous indications.

A3524/25

EST

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NavNavigation Aid Status

2025-11-23 09:13 - 2026-02-21 09:35

Duration:LONG4 months EST

Period of Applicability

2025-11-23 09:13 - 2026-02-21 09:35

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Interpretation

GPS is unreliable and may be unavailable within the lateral limits of the Tehran TMA (as defined in the Iran AIP) from the surface up to FL275. EGPWS/GPWS may display erroneous indications and map shifting, as frequently reported. Pilots shall report any GPS anomalies, including degraded operation or loss of service, as soon as possible.

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Raw NOTAM

A3524/25 NOTAMR A2240/25
Q) OIIX/QGAAU/I/NBO/A/000/275/
A) OIIE B) 2511230913 C) 2602210935 EST
E) GPS UNRELIABLE AND MAY BE UNAVAILABLE WITHIN AREA WITH
THE LATERAL LIMITS OF TEHRAN TMA AS SPECIFIED IN IRAN AIP,
FM GND UP TO FL 275,
EGPWS/GPWS MAY DISPLAY ERRONEOUS INDICATION AND MAP SHIFTING,
AS REPORTED FREQUENTLY
PILOTS SHALL REPORT GPS ANOMALIES INCLUDING DEGRADED OPERATION
AND/OR LOSS OF SERVICE, AS SOON AS POSSIBLE.
F) GND G) FL275

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