- Models
- DC-6, DC-6A, DC-6B
- Registered aircraft
- 17 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
54-06-01 DOUGLAS: Applies to Models DC-6, DC-6A and DC-6B Series Aircraft.
Compliance required as soon as practicable but not later than July 1, 1954, for DC-6A and DC-6B aircraft, and November 1, 1954, for DC-6 aircraft.
To eliminate possible inadvertent discharge of CO2 into cabin heater or hydraulic accessories compartment accompanied by operation of cabin master depressurization control (or closing of the control valve on early DC-6 aircraft), when discharging CO2 into a nacelle, rework the two Kidde 3/4-inch stop valves P/N 870003 by replacing spring P/N 201496 with heavier spring P/N 30568. The reworked valve should be reidentified as P/N 871107.
(Douglas General Service Letter No. DC-6 No. 176 revised December 31, 1953, also covers this subject.)
Affected TCDS · 3
The type certificate data sheets for the models this AD names, matched by model and maker.
Registered aircraft · 17
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 | 3 |
| 1958 | 3 |
| 1959 | 1 |
6 with no year recorded