# AD 47-10-19: Cabin Heater Fuel Solenoid Valve

- 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- Superseded by: Nothing supersedes this AD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/4DCCCCB2D18B4B378625696D004589EA.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/47-10-19

## The airworthiness directive

47-10-19 LOCKHEED: (Was Mandatory Note 21 of AD-763-3.) Applies to All Model 49 Serials Up to and Including 2088, Except as Noted.

Compliance required not later than 100 hours of operation after June 10, 1947.

  (a) In each cabin heater installation, relocate and waterproof the fuel solenoid valve and replace and reroute the fuel pump bypass line.

(LAC Service Bulletin 49/SB-73 covers this same subject.)

  (b) In zone 2 of each nacelle, install heat protective shield between propeller feathering line and cowl diaphragm. Applies to all serials up to and including 2082.

(LAC Service Bulletin 49/SB-150 covers this same subject.)

  (c) In each outboard nacelle main junction box, replace existing mounting nuts (tinnerman) and PK screws with AN 366 nuts and NAS 221 screws.

(LAC Service Bulletin 49/SB-152 covers this same subject.)

  (d) Drill one 1/4-inch drain hole on lower center line of spinner fairing lower panel assembly for each engine.

(LAC Service Instruction 49/SI-95 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 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/47-10-19/models.md
Every aircraft: https://openairdocs.org/ad/47-10-19/aircraft.md

Its text cites no advisory circulars or STCs.

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