AD 93-06-07

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AD Number:
93-06-07
Document Type:
AD Final Rules
Docket Number:
92-NM-81-AD
Subject Heading:
Airworthiness Directives; De Havilland Models DHC-7, DHC-8-102, DHC-8-103, DHC-8-301, and DHC-8-311 ...Show more
Subject:
Quantity Limiting Valves
Status:
Current
Citation:
This information is not available.
Citation Publish Date:
Effective Date:
05/12/1993
Make:
Bombardier Inc. | Viking Air Limited
Model:
DHC-8-102 | DHC-8-103 | DHC-8-301 | DHC-8-311 | 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Superseded AD: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Superseded By: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: 93-06-07
CITATION:   This information is not available.

PAGE NUMBER:  

DOCKET NUMBER:   92-NM-81-AD

AMENDMENT:   39-8532

AD NUMBER:   93-06-07

SUBJECT HEADING:   Airworthiness Directives; De Havilland Models DHC-7, DHC-8-102, DHC-8-103, DHC-8-301, and DHC-8-311 Series Airplanes

ACTION:  

SUMMARY:  

DATES:   Effective May 12, 1993.

ADDRESSES:  

FOR FURTHER INFORMATION CONTACT:  

SUPPLEMENTARY INFORMATION:  

REGULATORY TEXT:  
93-06-07 DE HAVILLAND, INC.: Amendment 39-8532. Docket 92-NM-81-AD.

Applicability: Model DHC-7 series airplanes, serial numbers 003 through 113, inclusive; Model DHC-8-102 and -103 series airplanes, serial numbers 003 through 321, inclusive; and Model DHC-8-301 and -311 series airplanes, serial numbers 100 through 320, inclusive; certificated in any category.

Compliance: Required as indicated, unless accomplished previously.

To prevent the loss of both hydraulic systems due to depletion of hydraulic fluid, accomplish the following:

(a) For Model DHC-7 series airplanes: Within 1,000 hours time-in-service after the effective date of this AD, or within 6 months after the effective date of this AD, whichever occurs first, remove the existing Quantity Limiting Valves (QLV), from the left- and right-hand inboard nacelles; and modify or replace them with new QLV, Modification 7/2610; in accordance with de Havilland Service Bulletin S.B. 7-29-20, dated March 20, 1992.

(b) For Model DHC-8-102 and -103 series airplanes and Model DHC-8-301 and -311 series airplanes that have accumulated 6,700 total hours time-in-service or more as of the effective date of this AD, or if 50 months or more have passed since the airplane was manufactured as of the effective date of this AD: Within 1,000 hours time-in-service after the effective date of this AD, or within 6 months after the effective date of this AD, whichever occurs first, remove the existing QLV from the left- and right-hand inboard nacelles; and modify or replace them with new QLV, Modification 8/1803; in accordance with de Havilland Service Bulletin S.B. 8-29-21, dated March 20, 1992.

(c) For Model DHC-8-102 and -103 series airplanes and Model DHC-8-301 and -311 series airplanes that have accumulated less than 6,700 total hours time-in-service as of the effective date of this AD and if less than 50 months have passed since the airplane was manufactured as of the effective date of this AD: Prior to the accumulation of 7,700 hours time-in-service since the airplane was manufactured, or within 12 months after the effective date of this AD, whichever occurs first, remove the existing QLV from the left- and right-hand inboard nacelles; and modify or replace them with new QLV, Modification 8/1803; in accordance with de Havilland Service Bulletin S.B. 8-29-21, dated March 20, 1992.

(d) An alternative method of compliance or adjustment of the compliance time that provides an acceptable level of safety may be used if approved by the Manager, New York Aircraft Certification Office (ACO), FAA, Engine and Propeller Directorate. Operators shall submit their requests through an appropriate FAA Principal Maintenance Inspector, who may add comments and then send it to the Manager, New York ACO.

NOTE: Information concerning the existence of approved alternative methods of compliance with this AD, if any, may be obtained from the New York ACO.

(e) Special flight permits may be issued in accordance with FAR 21.197 and 21.199 to operate the airplane to a location where the requirements of this AD can be accomplished.

(f) The removal, modification, and replacement shall be done in accordance with de Havilland Service Bulletin S.B. 7-29-20, dated March 20, 1992 (for Model DHC-7 series airplanes); or de Havilland Service Bulletin S.B. 8-29-21, dated March 20, 1992 (for Model DHC-8-102 and -103 series airplanes and Model DHC-8-301 and -311 series airplanes); as applicable. This incorporation by reference was approved by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR Part 51. Copies may be obtained from de Havilland, Inc., Garratt Boulevard, Downsview, Ontario M3K 1Y5, Canada. Copies may be inspected at the FAA, Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton, Washington; or at the FAA, Engine and Propeller Directorate, New York Aircraft Certification Office, 181 South Franklin Avenue, Room 202, Valley Stream, New York; or at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC.

(g) This amendment becomes effective on May 12, 1993.

FOOTER: