- Models
- 49-46, 649-79, 749-79
- Data sheet
- TCDSA-763
- Registered aircraft
- 2 matched by model
- Product
- Aircraft · Large airplane
Unofficial copy of the text in the FAA’s Dynamic Regulatory System. The FAA’s own copy is the authoritative one. DRS record last changed May 30, 2024.
Copies of the files this page was built from, with their SHA-256. Retrieved October 18, 2026.
| File | Size | SHA-256 | Original |
|---|---|---|---|
| FAA DRS HTML | 19 KB | 6e553209…4b22280 | FAA DRS (API key needed) |
On this page
The airworthiness directive
47-49-12 LOCKHEED: (Was Service Note 12 of AD-763-3.) Applies to All Models 49, 649, and 749 Serials Which Incorporate Short Type Metal Aft Doors for the Main Landing Gear.
At periods not to exceed 250 hours inspect the metal aft doors of the main landing gear for signs of cracks in the vicinity of the forward hinge attachments. When cracks are found, satisfactory reinforcements and doublers should be installed.
When doublers have been installed (doublers only are necessary if the doors are not already cracked) the periodic inspections may be discontinued.
(LAC Service Bulletin 49/SB-274 covers this same subject.)
Affected TCDS · 1
The type certificate data sheets for the models this AD names, matched by model and maker.
Registered aircraft · 2
Registered aircraft whose airframe or engine model this AD names. Matched by model only, so check each against the AD’s applicability.
| 1946 | 1 |
|---|---|
| 1949 | 1 |