AD 72-12-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 727-100 Series | BOEING Model 727 Series Airplanes |
| aircraft | The Boeing Company | 727-100C Series | BOEING Model 727 Series Airplanes |
| aircraft | The Boeing Company | 727-200 Series | BOEING Model 727 Series Airplanes |
| aircraft | The Boeing Company | 727-200F Series | BOEING Model 727 Series Airplanes |
| aircraft | The Boeing Company | 727 Series | BOEING Model 727 Series Airplanes |
| aircraft | The Boeing Company | 727C Series | BOEING Model 727 Series Airplanes |
Unsafe Condition
Cracks in the main landing gear downlock torque shaft P/N 65-23366 could result in failure of the downlock mechanism, leading to unintended retraction of the main landing gear.
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Required Actions
Inspect the main landing gear downlock torque shaft within 300 landings after the effective date of Amendment 39-2353 (September 29, 1975) if it has accumulated 8,000 or more landing cycles by that date. Subsequent inspections must occur every 400 landings until replaced. Replace the shaft with P/N 65-78698 or a shaft with less than 8,000 landing cycles if cracks are found. Replace all affected shafts per Boeing Service Bulletin 32-180 or equivalent.
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Compliance Time
Within the next 300 landings after the effective date of Amendment 39-2353 (September 29, 1975), unless already accomplished within the last 100 landings. Subsequent inspections must be done at intervals not exceeding 400 landings since the last inspection. Replacement must be done prior to further flight if cracks are found.
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Affected Aircraft
Boeing Model 727 Series airplanes listed in Boeing Service Bulletin No. 32-180, Revision 1, or later FAA-approved revisions, incorporating main landing gear downlock torque shaft P/N 65-23366.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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