AD 90-25-16

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AD Number:
90-25-16
Document Type:
AD Final Rules
Docket Number:
90-NM-147-AD
Subject Heading:
Airworthiness Directives; Boeing Of Canada, Ltd., De Havilland Division Model DHC-7 Series Airplanes
Subject:
Main Landing Gear
Status:
Current
Citation:
This information is not available.
Citation Publish Date:
Effective Date:
01/14/1991
Make:
Viking Air Limited
Model:
DHC-7-1 | DHC-7-100 | DHC-7-101 | DHC-7-102 | DHC-7-103
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Superseded AD: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Superseded By: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: 90-25-16
CITATION:   This information is not available.

PAGE NUMBER:  

DOCKET NUMBER:   90-NM-147-AD

AMENDMENT:   39-6827

AD NUMBER:   90-25-16

SUBJECT HEADING:   Airworthiness Directives; Boeing Of Canada, Ltd., De Havilland Division Model DHC-7 Series Airplanes

ACTION:  

SUMMARY:  

DATES:   Effective January 14, 1991.

ADDRESSES:  

FOR FURTHER INFORMATION CONTACT:  

SUPPLEMENTARY INFORMATION:  

REGULATORY TEXT:  
90-25-16 BOEING OF CANADA, LTD., DE HAVILLAND DIVISION: Amendment 39- 6827. Docket No. 90-NM-147-AD.

Applicability: All de Havilland Model DHC-7 series airplanes, certificated in any category.

Compliance: Required as indicated, unless previously accomplished.

To prevent possible malfunction of the right main landing gear (MLG), accomplish the following:

A. Within 100 landings after May 29, 1990 (the effective date of AD 90-09-02), and thereafter at intervals not to exceed 500 landings, conduct a visual inspection of the right MLG frame and attachment bolts, in accordance with paragraph A. of the Accomplishment Instructions in de Havilland Service Bulletin No. 7-24-66, Revision B, dated June 23, 1989.

1. If no damage is found, reassemble parts and return the airplane to service.

2. If damage is found, replace with serviceable parts prior to further flight, in accordance with the service bulletin.

B. Within 180 days after the effective date of this AD, install Modification No. 7/2577, which relocates the external power grounding stud, in accordance with paragraph B of the Accomplishment Instructions in de Havilland Service Bulletin No. 7-24-66, Revision B, dated June 23, 1989. Installation of this modification constitutes terminating action for the repetitive inspections required by paragraph A., above.

C. 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, New York Aircraft Certification Office (ACO), ANE-170.

NOTE: The request should be submitted directly to the Manager, New York Aircraft ACO, ANE-170, and a copy sent to the cognizant FAA Principal Inspector (PI). The PI will then forward comments or concurrence to the Manager, New York ACO, ANE-170.

D. 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 of Canada, Ltd., de Havilland Division, Garratt Boulevard, Downsview, Ontario M3K 1Y5, Canada. These documents may be examined at the FAA, Northwest Mountain Region, Transport Airplane Directorate, 1601 Lind Avenue S.W., Renton, Washington; or at the FAA, New England Region, New York Aircraft Certification Office, 181 South Franklin Avenue, Valley Stream, New York.

Airworthiness Directive 90-25-16 supersedes AD 90-09-02, Amendment 39-6579.

This amendment (39-6827, AD 90-25-16) becomes effective on January 14, 1991.

FOOTER: