# AD 70-15-01: Cabin Heater Blower

- Type: Airworthiness directive
- Status: Current
- Products: Sikorsky S-61A, S-61L, S-61N and S-61R
- Effective: July 22, 1970
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Rotorcraft
- Amendment: 39-1026
- Registered aircraft: 53 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/0040C5DD1E49627386256A55006DCB00.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/70-15-01

## The airworthiness directive

70-15-01 SIKORSKY AIRCRAFT: Amdt. 39-1026. Applies to Sikorsky S-61A/L/N/R Type Helicopters Certificated In All Categories and Incorporating Torrington A18702 Series Cabin Heater Blower Assemblies.

Compliance required within the next 25 hours' time of cabin heater operation after the effective date of this AD unless already accomplished.

To prevent potential hazards associated with intermittent operation of the cabin heater blower, accomplish the following:

  (a) Comply with the Accomplishment Instructions (excluding paragraph D) of Sikorsky Service Bulletin No. 61B55-14 dated 1 April 1970, or later revision, or equivalent method both approved by the Chief, Engineering and Manufacturing Branch, FAA, Eastern Region.

  (b) Upon request with substantiation data submitted through an FAA maintenance inspector, the compliance time specified in this AD may be increased by the Chief, Engineering and Manufacturing Branch, FAA, Eastern Region.

This amendment is effective July 22, 1970.

## Affected data sheets (2) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS 1H15](https://openairdocs.org/tcds/1H15): Sikorsky Aircraft; names 3 of 4 models: S-61R, S-61N, S-61L
- [TCDS H2EA](https://openairdocs.org/tcds/H2EA): Sikorsky Aircraft Corporation; names 1 of 4 models: S-61A

## 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: 53 (53 by airframe model, 0 by engine model)
- Makers: Sikorsky 52, Carson Helicopters / Sikorsky 1

Models with the most aircraft:

- [Sikorsky S-61N](https://openairdocs.org/model/sikorsky-s-61n): 45 aircraft (airframe model)
- [Sikorsky S-61A](https://openairdocs.org/model/sikorsky-s-61a): 5 aircraft (airframe model)
- [Sikorsky S-61L](https://openairdocs.org/model/sikorsky-s-61l): 1 aircraft (airframe model)
- [Sikorsky S-61R](https://openairdocs.org/model/sikorsky-s-61r): 1 aircraft (airframe model)
- [Carson Helicopters / Sikorsky S61A](https://openairdocs.org/model/carson-helicopters-sikorsky-s61a): 1 aircraft (airframe model)

All 5 models: https://openairdocs.org/ad/70-15-01/models.md
Every aircraft: https://openairdocs.org/ad/70-15-01/aircraft.md

Its text cites no advisory circulars or STCs.

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