# AD 49-05-01: Curtiss 850-4C2-0 Propeller Blades

- Type: Airworthiness directive
- Status: Current
- Products: Lockheed 749-79 and 749A-79
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Large airplane
- Registered aircraft: 1 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/E1262E058BF726B78625696D0071A70B.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/49-05-01

## The airworthiness directive

49-05-01 LOCKHEED: Applies to All 749 Aircraft Equipped With Curtiss 850-4C2-0 Propeller Blades.

Compliance required by March 25, 1949.

Magnetically inspect the shank section, as far outboard as the 18-inch station, of all 850- 4C2-0 blades delivered before November 1, 1948, having less than 700 hours service and which have not been magnafluxed since delivery, using a coil not greater than 27 inches in diameter and providing at least 8,000 ampere turns, inspection of blades with lowest service time should be accomplished first wherever possible.

(Curtiss Service Bulletin No. 47 covers this same subject.)

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS A-763](https://openairdocs.org/tcds/A-763): Lockheed Martin Aeronautics Company; names 2 of 6 models: 749A-79, 749-79

## 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: 1 (1 by airframe model, 0 by engine model)
- Makers: Lockheed 1

Models with the most aircraft:

- [Lockheed 749-79](https://openairdocs.org/model/lockheed-749-79): 1 aircraft (airframe model)

All 1 models: https://openairdocs.org/ad/49-05-01/models.md
Every aircraft: https://openairdocs.org/ad/49-05-01/aircraft.md

Its text cites no advisory circulars or STCs.

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