# AD 90-15-13: Propeller Relay

- Type: Airworthiness directive
- Status: Current
- Products: Mitsubishi Heavy Industries YS-11, YS-11A-200, YS-11A-300, YS-11A-500 and YS-11A-600
- Effective: August 20, 1990
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Large airplane
- Amendment: 39-6657
- Docket: 90-NM-29-AD
- Registered aircraft: 1 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/8B9434A7C8309A1586256A1E0073C2C9.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/90-15-13

## The airworthiness directive

90-15-13 MITSUBISHI HEAVY INDUSTRIES, LTD (formerly Nihon Aeroplane Manufacturing Company, NAMC): Amendment 39-6657. Docket No. 90-NM-29-AD. Applicability: Model YS-11 and YS-11A series airplanes, certificated in any category.

Compliance: Required as indicated, unless previously accomplished.

To prevent incidents of propellers failing to withdraw, accomplish the following:

A. Within 1,000 flight hours after the effective date of this AD:

1. Inspect the propeller high stop withdrawal relay in accordance with the accomplishment instructions of Mitsubishi NAMC YS-11 Service Bulletin 61-5, dated December 20, 1988. If any abnormality is detected, replace the relay prior to further flight.

2. Install Decal 01-81717-27 in accordance with Mitsubishi NAMC YS-11 Service Bulletin 15-27, dated December 20. 1988.

B. Repeat the inspection of the propeller high stop withdrawal relay at intervals not to exceed 3,000 flight hours after the initial inspection orafter replacement, in accordance with Mitsubishi NAMC YS-11 Service Bulletin 61-5, dated December 20, 1988. If any abnormality is detected, replace the relay prior to further flight.

C. Special flight permits may be issued in accordance with FAR 21.197 and 21.199 to operate airplanes to a base in order to comply with the requirements of this AD.

D. An alternate means of compliance or adjustment of the compliance time, which provides an acceptable level of safety, may be used if approved by the Manager, Los Angeles Aircraft Certification Office (ACO), FAA, Transport Airplane Directorate.

NOTE: The request should be submitted directly to the Manager, Los Angeles ACO, and a copy sent to the cognizant FAA Principal Inspector (PI). The PI will then forward comments or concurrence to the Los Angeles ACO.

All persons affected by this directive who have not already received the appropriate service documents from the manufacturer may obtain copies upon request to NagoyaAircraft Works Mitsubishi Heavy Industries, Ltd., 10 Oye-cho, Minato-Ku, Nagoya 455, Japan; Attention: K. Saitoh, Manager, YS- 11 Group, Service Department. These documents may be examined at the FAA, Northwest Mountain Region, Transport Airplane Directorate, 17900 Pacific Highway South, Seattle, Washington, or at the Los Angeles Aircraft Certification Office, 3229 East Spring Street, Long Beach, California.

This amendment (39-6657, AD 90-15-13) becomes effective on August 20, 1990.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS A1PC](https://openairdocs.org/tcds/A1PC): Mitsubishi Heavy Industries Ltd.; names 5 of 5 models: YS-11, YS-11A-300, YS-11A-500, YS-11A-600, YS-11A-200

## 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: 1 (1 by airframe model, 0 by engine model)
- Makers: Nihon 1

Models with the most aircraft:

- [Nihon YS-11A-500](https://openairdocs.org/model/nihon-ys-11a-500): 1 aircraft (airframe model)

All 1 models: https://openairdocs.org/ad/90-15-13/models.md
Every aircraft: https://openairdocs.org/ad/90-15-13/aircraft.md

Its text cites no advisory circulars or STCs.

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