Mode S transponder testing at Amesbury may cause false aircraft indications; avoid low direct overflight.

Q0169/26

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COMSurveillance Systems

Mode S transponder testing at Amesbury may cause false aircraft indications; avoid low direct overflight.

2026-11-02 08:30 - 2026-11-13 17:30

Duration:SHORTaggregated 5 days

Period of Applicability

2026-11-02 08:30 - 2026-11-13 17:30

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Interpretation

Ground testing of a Mode S transponder at Amesbury may cause false aircraft indications within 2 NM, potentially showing 300 kt and 99,000 ft AGL. Avoid direct overflight below 100 ft. Scheduled 0830–1730.

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Raw NOTAM

Q0169/26 NOTAMN
Q) EGTT/QXXLW/IV/BO /AW/000/999/5109N00146W003
A) EGDM B) 2611020830 C) 2611131730
D) 0830-1730
E) GROUND TRANSPONDER TESTING. MODE S TEST TRANSPONDER LOCATED PSN
510846N 0014531W (AMESBURY). POSSIBLE FALSE AIRCRAFT INDICATIONS
MAY OCCUR WI 2NM RADIUS. MAY INDICATE A SPEED OF 300KTS AND
99000FT AGL. DIRECT OVERFLIGHT BELOW 100FT SHOULD BE AVOIDED.
SFC-UNL. FOR INFO 01980 663052. AR-2026-10378/01.

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