AD 91-06-12

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AD Number:
91-06-12
Document Type:
AD Final Rules
Docket Number:
90-NM-194-AD
Subject Heading:
Airworthiness Directives; BOEING Model 757 Series Airplanes
Subject:
Leaf Springs
Status:
Current
Citation:
This information is not available.
Citation Publish Date:
Effective Date:
04/18/1991
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Superseded AD: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Superseded By: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: 91-06-12
CITATION:   This information is not available.

PAGE NUMBER:  

DOCKET NUMBER:   90-NM-194-AD

AMENDMENT:   39-6938

AD NUMBER:   91-06-12

SUBJECT HEADING:   Airworthiness Directives; BOEING Model 757 Series Airplanes

ACTION:  

SUMMARY:  

DATES:   Effective April 18, 1991.

ADDRESSES:  

FOR FURTHER INFORMATION CONTACT:  

SUPPLEMENTARY INFORMATION:  

REGULATORY TEXT:  
91-06-12 BOEING: Amendment 39-6938. Docket No. 90-NM-194-AD.

Applicability: Model 757 series airplanes listed in Boeing Alert Service Bulletin 757- 52A0049, dated July 5, 1990, certificated in any category.

Compliance: Required as indicated, unless previously accomplished.

To ensure left and right passenger door Number 4 opening when required for emergency use, accomplish the following:

A. Prior to the accumulation of 2,000 flight cycles, or within the next 100 flight cycles after the effective date of this AD, whichever occurs later, inspect the left and right Number 4 passenger door upper and lower hinge arm leaf springs for cracks and fractures, in accordance with Boeing Alert Service Bulletin 757-52A0049, dated July 5, 1990.

B. If cracked or fractured leaf springs are found as a result of the inspection required by paragraph A. of this AD, prior to further flight, accomplish either paragraph B.1. or B.2., below:

1. Replace cracked or fractured leaf springs in accordance with Section III. of the service bulletin; or

2. Replace the cracked or fractured leaf springs with new steel leaf springs in accordance with an FAA-approved method, and reinspect those springs prior to the accumulation of an additional 2,000 flight cycles and thereafter at intervals not to exceed 500 flight cycles until the terminating action, required by paragraph D. of this AD, is accomplished.

C. Repeat the inspection required by paragraph A. of this AD at the following intervals.

1. For airplanes with less than 5,000 flight cycles at the time of the last inspection: accomplish the next inspection within the next 500 flight cycles.

2. For airplanes with 5,000 or more flight cycles at the time of the last inspection: accomplish the next inspection within the next 150 flight cycles.

D. Within the next 18 months after the effective date of this AD, replace the upper and lower hinge arm steel leaf springs with titanium leaf springs for the left and right Number 4 passenger door, in accordance with Section III., of Boeing Alert Service Bulletin 757-52A0049, dated July 5, 1990. Such replacement constitutes terminating action for the repetitive inspections required by this AD.

E. 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.

F. 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 (39-6938, AD 91-06-12) becomes effective on April 18, 1991.

FOOTER: