# AD 51-28-01: Engine Accessory Section

- Type: Airworthiness directive
- Status: Current
- Products: Kelowna Flightcraft R & D 240 Series
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Large airplane
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/255BE3F2B01D9DDF862569AB006C5B3C.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/51-28-01

## The airworthiness directive

51-28-01 CONVAIR: Applies to All Model 240 Aircraft.

Compliance required as indicated.

1. Not later than the first No. 1 inspection after January 15, 1952, lag and shield propeller feathering line in the engine accessory section with asbestos tape, wire, vinylite tubing and steel-sleeve for end fittings as described in Convair Service Bulletin No. 240-419-A or in a manner to provide equivalent resistance to fire and absorption of fuel and oil.

2. Not later than March 1, 1952, revise the engine oil breather line to eliminate aluminum components as described in Convair Service Bulletin 240-419-A to use steel tubing or to use a fire resistant hose assembly.

3. Not later than first scheduled engine change after January 15, 1952, relocate fire detectors and revise detector circuits to employ split systems as described in Convair Service Bulletin Number 240-419-A.

4. Not later than the first scheduled engine change after January 15, 1952, replace fire detector wiring in all circuits forward of firewall with Rockbestos type RSS 74 Firezone wire or wire of equivalent fire resistance. (Wire conforming to Air Forces Spec. 32659 is considered equivalent.)

5. Not later than March 1, 1952, install CO2 operated engine accessory section ventilation outlet closure door. This modification is described in Convair Service Bulletin 240- 374.

6. Not later than the first scheduled engine change after March 1, 1952, either remove all aluminum fire detector terminal junction boxes located forward of the firewall and mount units on fireproof brackets, or change aluminum fire detector terminal boxes and brackets to fireproof material.

7. Not later than the first scheduled engine change after March 1, 1952, check firewalls and firewall access door fasteners to assure that no aluminum rivets or Dzus fasteners or other nonfireproof components have been installed. If any are found, they are to be replaced with fireproof components. Original firewall accessory door fasteners, which are satisfactory, have these Dzus part numbers: Studs AJ5-20 and -35; Grommet GA5-312; and Spring S5-200.

8. Not later than the first scheduled engine change after March 1, 1952, improve ADI valve sealing in accordance with Whittaker Service Bulletin Number 49-9 or install an enclosure which will provide overboard drainage if leakage occurs from this valve.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS A-793](https://openairdocs.org/tcds/A-793): Kelowna Flightcraft R & D Ltd.; names 1 of 1 models: 240 Series

## Registered aircraft it may apply to (OpenAirDocs)

No registered aircraft matched the models it names.

Its text cites no advisory circulars or STCs.

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