AD 78-13-07
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 737-100 Series | BOEING Model 737 series airplanes, including military type T43A airplanes |
| aircraft | The Boeing Company | 737-200 Series | BOEING Model 737 series airplanes, including military type T43A airplanes |
| aircraft | The Boeing Company | 737-200C Series | BOEING Model 737 series airplanes, including military type T43A airplanes |
| aircraft | The Boeing Company | 737-300 Series | BOEING Model 737 series airplanes, including military type T43A airplanes |
| aircraft | The Boeing Company | 737-400 Series | BOEING Model 737 series airplanes, including military type T43A airplanes |
| aircraft | The Boeing Company | 737-500 Series | BOEING Model 737 series airplanes, including military type T43A airplanes |
| aircraft | The Boeing Company | 737-600 Series | BOEING Model 737 series airplanes, including military type T43A airplanes |
| aircraft | The Boeing Company | 737-700 Series | BOEING Model 737 series airplanes, including military type T43A airplanes |
| aircraft | The Boeing Company | 737-800 Series | BOEING Model 737 series airplanes, including military type T43A airplanes |
Unsafe Condition
Cracks in the aft portion of the inboard and outboard flap tracks of the outboard trailing edge flap installation.
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Required Actions
Inspect inboard and outboard tracks via penetrant or magnetic particle inspection per Boeing Service Bulletins 737-57-1082/1084 or approved methods. Replace or repair cracked tracks as specified. Repeat inspections at intervals not exceeding 1,200 landings (or shorter intervals for repaired tracks per specified criteria).
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Compliance Time
Within the next 600 landings from the effective date (July 12, 1978) or prior to 4,000 landings for inboard tracks; within the next 900 landings or prior to 7,000 landings for outboard tracks, whichever occurs later.
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Affected Aircraft
Boeing Model 737 series airplanes (737-100, -200, -200C, -300, -400, -500 series) and military type T43A airplanes, certificated in all categories.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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