AD 75-20-05
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 747-100 Series | BOEING Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-100B Series | BOEING Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-100B SUD Series | BOEING Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-200B Series | BOEING Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-200C Series | BOEING Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-200F Series | BOEING Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-300 Series | BOEING Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-400 Series | BOEING Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-400D Series | BOEING Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-400F Series | BOEING Model 747 Series Airplanes |
Unsafe Condition
Fore flap separations due to seized rollers, cracked attach fittings, and cracked outboard fore flap inboard carriage frames.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect fore flap track rollers and tracks for sliding/seized conditions, lubricate rollers per Boeing Service Bulletin 747-57-2107, and replace seized rollers unless fittings and tracks are free of cracks and binding. Inspect attach fittings for cracks per SB 747-57-2119/2088 and replace if exceeded limits. Inspect outboard fore flap inboard carriage frames for cracks per SB 747-57-2126, repair or replace as specified. Install new bolts with sealant per SB 747-57-2128. Replace inboard trailing edge fittings and certain rollers by Dec 31, 1976. Cut inspection holes in mid flaps per SB 747-57-2138. Adjust inspection intervals upon FAA approval.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within the next 100 flights after the effective date (12/12/1975) unless accomplished within last 200 flights, and at intervals not exceeding 350 flights. Some actions must be done by Dec 31, 1976, or next airload roller inspection.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Boeing Model 747 series airplanes certificated in all categories, including 747-100, 100B, 100B SUD, 200B, 200C, and other series as listed.
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
This site is not affiliated with or endorsed by the FAA. Always verify with official sources.