AD 90-20-06

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AD Number:
90-20-06
Document Type:
AD Final Rules
Docket Number:
90-NM-89-AD
Subject Heading:
Airworthiness Directives; BOEING Model 757 Series Airplanes
Subject:
Ram Air Turbine Actuator
Status:
Current
Citation:
This information is not available.
Citation Publish Date:
Effective Date:
10/29/1990
Make:
The Boeing Company
Model:
757-200 Series | 757-200CB Series | 757-200PF Series | 757-300 Series
Product Type:
Aircraft
Product Subtype:
Large Airplane
Affected AD:
Superseded AD:
Affected By:
Superseded By:
Service/Office:
Office of Primary Responsibility:
CFR Part Reference:
Part 39
Comments:
AIRWORTHINESS DIRECTIVES FINAL RULES: 90-20-06
CITATION:   This information is not available.

PAGE NUMBER:  

DOCKET NUMBER:   90-NM-89-AD

AMENDMENT:   39-6748

AD NUMBER:   90-20-06

SUBJECT HEADING:   Airworthiness Directives; BOEING Model 757 Series Airplanes

ACTION:  

SUMMARY:  

DATES:   Effective October 29, 1990.

ADDRESSES:  

FOR FURTHER INFORMATION CONTACT:  

SUPPLEMENTARY INFORMATION:  

REGULATORY TEXT:  
90-20-06 BOEING: Amendment 39-6748. Docket No. 90-NM-89-AD.

Applicability: Model 757 series airplanes, equipped with Arkwin Industries Incorporated part number (P/N) 1211233-005 ram air turbine deployment actuators with serial numbers 213 through 285, certificated in any category.

Compliance: Required within the next 3,000 hours time-in-service after the effective date of this AD, unless previously accomplished.

To prevent loss of hydraulic power due to failure of the ram air turbine to deploy in the event of dual engine failure, accomplish the following:

A. Replace the ram air turbine deployment actuator in accordance with Arkwin Industries Incorporated Service Bulletin 1211233-29-02, dated July 25, 1989.

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

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

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.

All persons affected by this directive who have not already received the appropriate service documents from the manufacturer may obtain copies upon request to Boeing Commercial Airplane Group, P.O. Box 3707, Seattle, Washington 98124. These documents may be examined at the FAA, Northwest Mountain Region, Transport Airplane Directorate, 1601 Lind Avenue S.W., Renton, Washington.

This amendment (39-6748, AD 90-20-06) becomes effective on October 29, 1990.

FOOTER: