# AD 74-19-04: Applicability to All HRS/H19 Series

- Type: Airworthiness directive
- Status: Current
- Products: Orlando Helicopter Airways HRS-1/CH-19 and HRS-3/H-19B
- Effective: September 10, 1974
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Rotorcraft
- Amendment: 39-1953
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/E1E154477D58537686256A5600456228.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/74-19-04

## The airworthiness directive

74-19-04 SIKORSKY: Amendment 39-1953. Applies to all HRS/H-19 Series Helicopters certificated in all categories.

Compliance with each of the following Airworthiness Directives for the Sikorsky S-55 Series Helicopters is required, except that the effective date of each will be the effective date of this Airworthiness Directive: 54-1-3, 54-13-1, 54-16-1, 54-19-2, 54-20-2, 55-25-4, 56-16-3, 56- 23-3, 60-13-4, 63-5-2 (AD 63-5-2 extended service life to 1200 hours when operating in the Restricted Category and over sparsely populated areas), 65-8-2, 66-4-3 (AD 66-4-3 extended service life to 3500 hours, when operating in the Restricted Category and over sparsely populated areas), 67-17-6, 67-29-7 and 71-26-3.

This amendment becomes effective September 10, 1974.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS HR1SO](https://openairdocs.org/tcds/HR1SO): Orlando Helicopter Airways Inc.; names 2 of 10 models: HRS-3/H-19B, HRS-1/CH-19

## 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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