- Effective
- May 9, 1961
- Published
- April 8, 1961
- Models
- DC-6, DC-6A, DC-6B, DC-7, DC-7B, DC-7C
- Registered aircraft
- 22 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.
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On this page
The airworthiness directive
61-08-01 DOUGLAS: Amdt. 273 Part 507 Federal Register April 8, 1961. Applies to All DC-6 and DC-7 Series Airplanes Which Do Not Have Antifuel Transfer Check Valves Installed In The Fuel System.
Compliance required within the next 330 hours' time in service.
(a) Install a placard in the flight compartment in full view of the pilot to read as follows: "Fuel Transfer in Flight Prohibited."
(b) Revise the operations procedures section covering fuel system management in the FAA approved airplane flight manual to incorporate fuel system operation procedures in accordance with the above placard and delete the item which states that check valves are installed. Flight manual revisions must be approved by FAA.
When check valves to prevent transfer of fuel are installed, this AD is no longer applicable.
(Douglas Service Bulletin No. DC-6-294 dated November 19, 1948, revised February 17, 1950, covers an acceptable installation of check valves.)
This directive effective May 9, 1961.
Affected TCDS · 4
The type certificate data sheets for the models this AD names, matched by model and maker.
Registered aircraft · 22
Registered aircraft whose airframe or engine model this AD names. Matched by model only, so check each against the AD’s applicability.
| 1953 | 1 |
|---|---|
| 1954 | 2 |
| 1956 | 1 |
| 1957 | 4 |
| 1958 | 5 |
| 1959 | 1 |
8 with no year recorded