# AD 80-26-06: Tail Rotor Plate

- Type: Airworthiness directive
- Status: Current
- Products: Robinson Helicopter R22
- Effective: December 29, 1980
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Rotorcraft
- Amendment: 39-3997
- Registered aircraft: 133 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/6E96C01A6A90103786256A4E0046FBB1.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/80-26-06

## The airworthiness directive

80-26-06 ROBINSON HELICOPTER: Amendment 39-3997. Applies to Model R-22 series helicopters certified in all categories, serial numbers 0002 through 0058.

Compliance is required as indicated unless already accomplished.

To prevent failure of the A093-2 forward tail rotor coupling flex plate and loss of power to the tail rotor, accomplish the following:

  (a) Prior to further flight from the effective date of this AD, conduct a one time inspection of the A193-2 forward tail rotor coupling flex plate. Inspect in accordance with the Robinson Service Letter No. 6, dated September 24, 1980. Remove from service any flex plate found cracked, bent, nicked, or with loose clamp-up. Replace the removed part with a like serviceable part.

  (b) Prior to further flight from the effective date of this AD, conduct a one time inspection of the A197-1 tail rotor drive shaft assembly in accordance with the Robinson Service Letter No. 7, dated September 27, 1980. Drive shafts withTIR (Total Indicated Runout) in excess of 0.015 inch or with excessive vibration must be removed from service and replaced with a like serviceable part.

  (c) Special flight permits may be issued in accordance with FAR 21.197 and 21.199 to operate helicopters to a base for the accomplishment of inspections required by this AD.

  (d) Alternative inspections, modifications or other actions which provide an equivalent level of safety may be used when approved by the Chief, Engineering and Manufacturing Branch, FAA Western Region.

This amendment becomes effective December 29, 1980.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS H10WE](https://openairdocs.org/tcds/H10WE): Robinson Helicopter Company; names 1 of 4 models: R22

## 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: 133 (133 by airframe model, 0 by engine model)
- Makers: Robinson Helicopter 133

Models with the most aircraft:

- [Robinson Helicopter R22](https://openairdocs.org/model/robinson-helicopter-r22): 131 aircraft (airframe model)
- [Robinson Helicopter R22 BETA II](https://openairdocs.org/model/robinson-helicopter-r22-beta-ii): 2 aircraft (airframe model)

All 2 models: https://openairdocs.org/ad/80-26-06/models.md
Every aircraft: https://openairdocs.org/ad/80-26-06/aircraft.md

Its text cites no advisory circulars or STCs.

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