# AD 74-17-02: Rotor Blade Inspection System

- Type: Airworthiness directive
- Status: Current
- Products: Columbia Helicopters 107-II
- Effective: August 13, 1974
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Rotorcraft
- Amendment: 39-1915
- Registered aircraft: 12 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/B6F2CC473EC4ED8B86256A34005B94E3.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/74-17-02

## The airworthiness directive

74-17-02 VERTOL: Amendment 39-1915. Applies to Vertol Model 107-II type helicopters certificated in all categories.

1. Prior to the next flight after the effective date of this AD, unless already accomplished, an inspection program for the rotor blades which has been approved by the Chief, Engineering and Manufacturing Branch, FAA, Eastern Region, subsequent to March 28, 1974 must be initiated.

2. An acceptable program is one afforded by forward and aft rotor blades altered, inspected and maintained in accordance with Boeing Vertol Service Bulletin 107-329 or later FAA approved revisions. The visual checks of the rotor blade pressure indicator required by paragraph 2 of this AD may be performed by the pilot.

This amendment is effective August 13, 1974.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS 1H16](https://openairdocs.org/tcds/1H16): Columbia Helicopters Inc.; names 1 of 1 models: 107-II

## 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: Boeing-Vertol 7, Columbia Helicopters 2, Vertol 2, Boeing V-Columbia Helicopters 1

Models with the most aircraft:

- [Boeing-Vertol 107-II](https://openairdocs.org/model/boeing-vertol-107-ii): 7 aircraft (airframe model)
- [Columbia Helicopters 107-II](https://openairdocs.org/model/columbia-helicopters-107-ii): 2 aircraft (airframe model)
- [Vertol 107-II](https://openairdocs.org/model/vertol-107-ii): 2 aircraft (airframe model)
- [Boeing V-Columbia Helicopters 107-II](https://openairdocs.org/model/boeing-v-columbia-helicopters-107-ii): 1 aircraft (airframe model)

All 4 models: https://openairdocs.org/ad/74-17-02/models.md
Every aircraft: https://openairdocs.org/ad/74-17-02/aircraft.md

Its text cites no advisory circulars or STCs.

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