# AD 47-10-16: Conversion of 49-51 to 49-46

- Type: Airworthiness directive
- Status: Current
- Products: Lockheed 49-46
- Superseded by: Nothing supersedes this AD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/ED0F27C26D0A6D6E8625696D0071A11F.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/47-10-16

## The airworthiness directive

47-10-16 LOCKHEED: (Was Mandatory Note 18 of AD-763-3.) Applies to All Model 49-46 Serials Up to and Including 2075 and to All Model 49-51 Airplanes. (This supersedes Supplement Number 1 to AD-763 (Special) Dated August 26, 1946.)

Compliance required prior to June 1, 1947.

All Model 49-51 aircraft shall be converted to Model 49-46 aircraft. Prior to recertification of Model 49-46 aircraft converted from Model 49-51 aircraft, the following Service Bulletins in addition to those listed in Note 47-10-15 must be complied with:

**49/SB-1, revised June 7, 1946 - Installation of Two-Speed Supercharger Controls.

*49/SB-14, revised July 27, 1946 - Installation of Bendix Direct Fuel Injection System.

49/SB-24, dated June 5, 1946 - Rework of Engine Cowl Diaphragm Structure.

49/SB-124, revised July 27, 1946 - Rewiring of Engine Fire Detector System.

Wright Aeronautical Corp. Bulletin C18-23, dated October 4, 1946 - Fuel Injection Tube Installation.

**49/SB-230, dated November 3, 1946 - Engine Oil Cooler Temperature Control Regulators - Recalibration of.

**49/SB-231, dated November 2, 1946 - Engine Oil Pump Pressure and Engine Oil Pressure Gauge Range Markings - Adjustment of.

*Service Bulletin 49/SB-14 has been revised subsequent to issuance of AD-763 (Special), Supplement No. 1, dated Aug. 26, 1946. Model 49-46 aircraft certificated in accordance with that AD Supplement should be checked for compliance with this later revision within next 200 hours of operation.

**Service Bulletin 49/SB-1 was not listed in AD-763 (Special), Supplement No. 1, dated Aug. 26, 1946, but must be complied with to permit use of new performance values shown in the Operation Manual for Model 49-46 aircraft, Lockheed Report No. 5817. All Model 49-46 aircraft certificated in accordance with that Supplement to AD-763 (Special) should be checked for compliance with Bulletins 49/SB-1, 230 and 231 within next 200 hours of operation.

## 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 1 of 6 models: 49-46

## 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 49-46](https://openairdocs.org/model/lockheed-49-46): 1 aircraft (airframe model)

All 1 models: https://openairdocs.org/ad/47-10-16/models.md
Every aircraft: https://openairdocs.org/ad/47-10-16/aircraft.md

Its text cites no advisory circulars or STCs.

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