AD 77-13-02

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AD Number:
77-13-02
Document Type:
AD Final Rules
Docket Number:
Unknown
Subject Heading:
Airworthiness Directives; HAWKER SIDDELEY AVIATION, LTD Model DH/BH-125 Airplanes
Subject:
Brake Control
Status:
Current
Citation:
This information is not available.
Citation Publish Date:
Effective Date:
07/20/1977
Make:
Textron Aviation Inc.
Model:
BH.125 Series 400A | BH.125 Series 600A | DH.125 Series 1A | DH.125 Series 1A-522 | DH.125 Series 1A...Show more
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Superseded AD: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Superseded By: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: 77-13-02
CITATION:   This information is not available.

PAGE NUMBER:  

DOCKET NUMBER:   Unknown

AMENDMENT:   39-2926

AD NUMBER:   77-13-02

SUBJECT HEADING:   Airworthiness Directives; HAWKER SIDDELEY AVIATION, LTD Model DH/BH-125 Airplanes

ACTION:  

SUMMARY:  

DATES:   Effective July 20, 1977.

ADDRESSES:  

FOR FURTHER INFORMATION CONTACT:  

SUPPLEMENTARY INFORMATION:  

REGULATORY TEXT:  
77-13-02 HAWKER SIDDELEY AVIATION, LTD:
Amendment 39-2926. Applies to Model DH/BH-125 airplanes, all series, certificated in all categories.

Compliance is required as indicated.

To prevent the failure of the knife edges of the brake control valve, P/N AC. 61520, and the possible complete loss of braking on one side of the airplane with no advance warning to the flight crew, accomplish the following:

(a) Comply with paragraph (b) or (c) of this AD as follows, and, thereafter, continue to comply with paragraph (b) or (c) of this AD at intervals not to exceed 4,500 landings since last compliance:

(1) For airplanes having brake control valve knife edges that have accumulated less than 4,300 landings on the effective date of this AD, compliance is required prior to the accumulation of 4,500 landings.

(2) For airplanes having brake control valve knife edges that have accumulated 4,300 or more landings, but less than 5,900 landings, on the effective date of this AD, compliance is required prior to the accumulation of an additional 200 landings.

(3) For airplanes having brake control valve knife edges that have accumulated 5,900 or more landings on the effective date of this AD, compliance is required prior to the accumulation of 6,100 landings or an additional 100 landings whichever occurs later.

(4) For airplanes for which no records exist that indicate the number of landings the brake control valve knife edges have accumulated, compliance is required prior to the accumulation of 100 landings after the effective date of this AD.

(b) Replace the knife edges with new parts, P/Ns ACO. 34629, ACO. 34630, and ACO. 36133, in accordance with Paragraph A, of Section 2, titled "Accomplishment Instructions," of Hawker Siddeley Aviation, Ltd. Service Bulletin 32-166, dated January 27, 1976, or an FAA- approved equivalent.

(c) Replace the brake control valve, P/N AC. 61520, with a valve of the same part number that incorporates knife edges having part numbers specified in paragraph (b) of this AD in accordance with Paragraph B, of Section 2, titled "Accomplishment Instructions," of Hawker Siddeley Aviation, Ltd. Service Bulletin 32- 166, dated January 27, 1976, or an FAA-approved equivalent.

This amendment becomes effective July 20, 1977.

FOOTER: