AD 74-19-07
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 747-100 Series | BOEING Model 747 Series Aircraft |
| aircraft | The Boeing Company | 747-100B Series | BOEING Model 747 Series Aircraft |
| aircraft | The Boeing Company | 747-100B SUD Series | BOEING Model 747 Series Aircraft |
| aircraft | The Boeing Company | 747-200B Series | BOEING Model 747 Series Aircraft |
| aircraft | The Boeing Company | 747-200C Series | BOEING Model 747 Series Aircraft |
| aircraft | The Boeing Company | 747-200F Series | BOEING Model 747 Series Aircraft |
| aircraft | The Boeing Company | 747-300 Series | BOEING Model 747 Series Aircraft |
| aircraft | The Boeing Company | 747-400 Series | BOEING Model 747 Series Aircraft |
| aircraft | The Boeing Company | 747-400D Series | BOEING Model 747 Series Aircraft |
| aircraft | The Boeing Company | 747-400F Series | BOEING Model 747 Series Aircraft |
Unsafe Condition
The flap control handle detent pin may wear beyond acceptable thickness limits, leading to potential loss of flap position detent function.
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Required Actions
Within the next 100 flights, determine the thickness of the flap control handle detent pin and inspect or replace based on remaining thickness. Pins with ≤0.045 inch thickness must be replaced before further flight. Relocate the bias spring by September 1, 1975. Rework the detent pin, refinish the detent plate, and relocate the bias spring as terminating actions.
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Compliance Time
Within the next 100 flights, on or before September 1, 1975, and prior to further flight as specified.
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Affected Aircraft
Boeing Model 747 Series aircraft certificated in all categories with more than 2,000 flights.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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