# AD 70-03-07: Auxiliary Power Units

- Type: Airworthiness directive
- Status: Current
- Products: Airesearch Auxiliary Power Units, 240 Series, 340 and 440
- Superseded by: Nothing supersedes this AD
- Product type: Appliance
- Amendment: 39-936
- Registered aircraft: 12 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/FB3C63E52509179386256A32004909E7.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/70-03-07

## The airworthiness directive

70-03-07 AIRESEARCH: Amdt. 39-936. Applicable to operators of aircraft with AiResearch model GTP30-141 Auxiliary Power Units installed, including but not limited to, those Convair 600/640 aircraft listed in AiResearch Telegraphic Bulletin No. 49-A1838, dated January 17, 1970, or later FAA approved revisions.

Within ten (10) hours time in service, install a placard in full view of the pilot, to read: "Operation of the APU is prohibited in flight, except in emergency. Operate the APU at no load for at least one minute before shutdown." This placard may be removed when the APU is replaced with APU modified to series 4 or Change 5 in accordance with AiResearch Telegraphic Service Bulletin No. 49-A1838, dated January 17, 1970, or later FAA approved revisions.

This amendment is effective upon publication in the Federal Register for all persons except those to whom it was made effective immediately by telegram dated January 23, 1970.

## Affected data sheets (2) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS 6A6](https://openairdocs.org/tcds/6A6): Kelowna Flightcraft R & D Ltd.; names 2 of 6 models: 340, 440
- [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)

Matched by airframe and engine model; the AD's applicability may narrow it by serial number, part number or equipment.

- Aircraft: 12 (12 by airframe model, 0 by engine model)
- Makers: Convair 12

Models with the most aircraft:

- [Convair 340](https://openairdocs.org/model/convair-340): 7 aircraft (airframe model)
- [Convair 440](https://openairdocs.org/model/convair-440): 5 aircraft (airframe model)

All 2 models: https://openairdocs.org/ad/70-03-07/models.md
Every aircraft: https://openairdocs.org/ad/70-03-07/aircraft.md

Its text cites no advisory circulars or STCs.

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