# AD 46-11-02: Copilot Oxygen Regulator

- Type: Airworthiness directive
- Status: Current
- Products: Boeing C54-DC, C54A-DC, C54B-DC, C54D-DC, C54E-DC and C54G-DC
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Large airplane
- Registered aircraft: 4 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/7E6962829FA0E8798625683200728DD0.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/46-11-02

## The airworthiness directive

46-11-02 DOUGLAS: (Was Mandatory Note 1 of AD-762-7.) Applies to All C-54 Series Aircraft.

To be accomplished not later than July 1, 1948.

The copilot oxygen regulator must be relocated from its position below the autopilot control handle to Station 101 aft of the windshield defroster control plate and knob, in order to eliminate a fire hazard and contamination of the oxygen regulator in the event hydraulic fluid drips on the regulator from the autopilot control valve.

(Douglas Service Bulletin No. C-54-247 dated November 16, 1945, covers this same subject.)

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS A-762](https://openairdocs.org/tcds/A-762): The Boeing Company; names 6 of 7 models: C54E-DC, C54G-DC, C54B-DC, C54A-DC, C54D-DC, C54-DC

## Registered aircraft it may apply to (OpenAirDocs)

Matched by airframe and engine model; the AD's applicability may narrow it by serial number, part number or equipment.

- Aircraft: 4 (4 by airframe model, 0 by engine model)
- Makers: Douglas 4

Models with the most aircraft:

- [Douglas C54D-DC](https://openairdocs.org/model/douglas-c54d-dc): 2 aircraft (airframe model)
- [Douglas C54E-DC](https://openairdocs.org/model/douglas-c54e-dc): 1 aircraft (airframe model)
- [Douglas C54G-DC](https://openairdocs.org/model/douglas-c54g-dc): 1 aircraft (airframe model)

All 3 models: https://openairdocs.org/ad/46-11-02/models.md
Every aircraft: https://openairdocs.org/ad/46-11-02/aircraft.md

Its text cites no advisory circulars or STCs.

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