AD 2013-10-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Sikorsky | Various | Airworthiness Directives; Spectrolab Nightsun XP Searchlight |
Unsafe Condition
A loose Gimbal Azimuth Top Hex Nut could result in a gap between the rubber edging of the top shroud and the Gimbal frame, leading to excessive vibration and degradation of pointing accuracy and stability performance. If the nut disengages, the searchlight could disconnect from the helicopter, causing damage or injury.
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Required Actions
Insert information into the Normal Procedures section of the Rotorcraft Flight Manual (RFM). Perform a daily check of the searchlight. Modify the searchlight gimbal assembly if the nut is loose or at a specified time interval.
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Compliance Time
Before further flight
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Affected Aircraft
Spectrolab Nightsun XP Searchlight Assembly installed on Agusta AB139 and AW139, Sikorsky S-92A, and Eurocopter MBB-BK 117 C2 and EC 135 series helicopters.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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