AD 99-15-09
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 737-600 Series | Airworthiness Directives; BOEING Model 737-600 Series Airplanes |
Unsafe Condition
Fracturing of the elevator tab mast fitting and excessive freeplay in the elevator tab could result in separation of the tab mast fitting from the tab, leading to severe airframe vibration and loss of controllability.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Revise the AFM to prohibit operation at certain airspeeds with speed brakes extended and above FL 390. Conduct repetitive high frequency eddy current and visual inspections of elevator tab mast fittings for cracking, and a one-time freeplay check. Install an additional fastener on the mast fitting to terminate AFM revisions and extend inspections. Replace the mast fitting with an improved design to terminate AD requirements.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Before further flight after landing if emergency speed brake deployment occurs above 310 knots IAS. Otherwise, inspections and checks must be done per specified intervals.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Boeing Model 737-600 series airplanes as specified in Boeing Alert Service Bulletin 737-55A1068 and Service Bulletin 737-55-1063.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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