AD 90-20-21

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AD Number:
90-20-21
Document Type:
AD Final Rules
Docket Number:
90-NM-69-AD
Subject Heading:
Airworthiness Directives; Boeing Of Canada, Ltd., De Havilland Division Model DHC-8-100 Series Airplanes
Subject:
Cowl Doors
Status:
Current
Citation:
This information is not available.
Citation Publish Date:
Effective Date:
10/26/1990
Make:
Bombardier Inc.
Model:
DHC-8-101 | DHC-8-102 | DHC-8-103 | DHC-8-106
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Superseded AD: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Superseded By: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: 90-20-21
CITATION:   This information is not available.

PAGE NUMBER:  

DOCKET NUMBER:   90-NM-69-AD

AMENDMENT:   39-6745

AD NUMBER:   90-20-21

SUBJECT HEADING:   Airworthiness Directives; Boeing Of Canada, Ltd., De Havilland Division Model DHC-8-100 Series Airplanes

ACTION:  

SUMMARY:  

DATES:   Effective October 26, 1990.

ADDRESSES:  

FOR FURTHER INFORMATION CONTACT:  

SUPPLEMENTARY INFORMATION:  

REGULATORY TEXT:  
90-20-21 BOEING OF CANADA, LTD., DE HAVILLAND DIVISION: Amendment No. 39-6745. Docket No. 90-NM-69-AD.

Applicability: De Havilland Model DHC-8-100 series airplanes, Serial Numbers 1 through 156 and 158 through 193, certificated in any category.

Compliance: Required within 300 days after the effective date of this AD, unless previously accomplished.

To prevent deformation or loss of the engine forward side cowl doors due to compartment overpressurization, and subsequent loss of fire extinguishing capability, accomplish the following:

A. Modify the cowl door retention latch arrangement and install pressure relief features on both engine cowlings, in accordance with the Accomplishment Instructions in de Havilland Service Bulletin No. 8-71-13, Revision C, dated January 12, 1990.

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, New York Aircraft Certification Office (ACO), ANE-170, FAA, New England Region.

NOTE: The request should be submitted directly to the Manager, New York ACO, 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.

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 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 Airplne Directorate, 1601 Lind Avenue S.W., Renton, Washington; or at the FAA, New England Region, New York Aircraft Certification Office, 181 South Franklin Avenue, Room 202, Valley Stream, New York.

This amendment (39-6745, AD 90-20-21) becomes effective on October 26, 1990.

FOOTER: