GPS is unreliable or unavailable within Tehran TMA, and EGPWS/GPWS may show erroneous indications; pilots must report GPS anomalies.

A3526/25

EST

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NavNavigation Aid Status

2025-11-23 09:34 - 2026-02-21 09:35

Duration:LONG4 months EST

Period of Applicability

2025-11-23 09:34 - 2026-02-21 09:35

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Interpretation

GPS may be unreliable and may be unavailable within the lateral limits of Tehran TMA from ground level up to FL275, with EGPWS/GPWS possibly displaying erroneous indications and map shifting; pilots are required to report any GPS anomalies including degraded operation or loss of service as soon as possible.

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Raw NOTAM

A3526/25 NOTAMR A2247/25
Q) OIIX/QGAAU/I/NBO/A/000/275/
A) OIII B) 2511230934 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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