# AD 47-10-09: Oil Line Cover Plates

- 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- Superseded by: Nothing supersedes this AD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/8808FBBE03AE45468625696D0071A038.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/47-10-09

## The airworthiness directive

47-10-09 LOCKHEED: (Was Mandatory Note 8 of AD-763-3.) Applies to All Model 49 Serials Up to and Including 2088.

Compliance required after each engine change.

When found necessary as a result of engine replacement in a quick-change powerplant unit, add seal plates to the engine oil lines where they pass through the engine fire seals, and add cover plates to the alternate oil line cutouts in the fire seals.

(LAC Service Instruction 49/51-39 and LAC Service Bulletin 49/SB-63 cover this same subject for Models 49-51 and 49-46, respectively.)

## 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/47-10-09/models.md
Every aircraft: https://openairdocs.org/ad/47-10-09/aircraft.md

Its text cites no advisory circulars or STCs.

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