# AD 50-16-01: Propeller Reverse Mechanism

- Type: Airworthiness directive
- Status: Current
- Products: Boeing DC-6, DC-6A and DC-6B
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Large airplane
- Registered aircraft: 17 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/FF74BC1D2AD45649862569BC005ECFF8.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/50-16-01

## The airworthiness directive

50-16-01 DOUGLAS: Applies to All Model DC-6 Airplanes Below Serial Number 43149.

Compliance required as soon as possible but in any event not later than January 1, 1951.

1. Conduct electrical and mechanical functional check of propeller reverse mechanism, throttle system.

2. (a) Rework fish mouth in the 2345735 throttle latch assembly to assure a more positive lock.

  (b) Rotate the 2333338 arm-throttle reverse 20 degrees clockwise on the shaft of the 4333339 lock assembly or replace with new 2333338 "F" change parts.

(Douglas General Service Letters DC-6 No. 19, dated November 18, 1949, and DC-6 No. 23, dated January 20, 1950, cover the above two items.)

## Affected data sheets (3) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS 6A3](https://openairdocs.org/tcds/6A3): The Boeing Company; names 1 of 3 models: DC-6A
- [TCDS 6A4](https://openairdocs.org/tcds/6A4): The Boeing Company; names 1 of 2 models: DC-6B
- [TCDS A-781](https://openairdocs.org/tcds/A-781): The Boeing Company; names 1 of 1 models: DC-6

## 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: 17 (17 by airframe model, 0 by engine model)
- Makers: Douglas 17

Models with the most aircraft:

- [Douglas DC-6B](https://openairdocs.org/model/douglas-dc-6b): 9 aircraft (airframe model)
- [Douglas DC-6A](https://openairdocs.org/model/douglas-dc-6a): 7 aircraft (airframe model)
- [Douglas DC-6](https://openairdocs.org/model/douglas-dc-6): 1 aircraft (airframe model)

All 3 models: https://openairdocs.org/ad/50-16-01/models.md
Every aircraft: https://openairdocs.org/ad/50-16-01/aircraft.md

Its text cites no advisory circulars or STCs.

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