- 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 | f7ee87e9…3f21205 | FAA DRS (API key needed) |
On this page
The airworthiness directive
47-49-11 LOCKHEED: (Was Service Note 11 of AD-763-3.) Applies to Models 49, 649, and 749 Serials as Noted.
At periods not to exceed 50 hours of operation, inspect the following fuel system elements to determine that they are tight and will not permit leakage or other hazardous conditions:
(a) Fuel dump valve shaft gland nuts (Serials up to and including 2075).
(b) Valves on drain lines from outboard portion of inboard fuel tanks, fuel system crossfeed lines, and cabin heater fuel lines (Serials 2047 to 2088, inclusive, and 2501 to 2503, inclusive).
If safety wiring of these items is provided, the required inspections may be discontinued.
(Lockheed Service Bulletin 49/SB-215 covers part (a), and Lockheed Service Instruction 49/SI-10A covers part (b).)
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 |