AD 77-13-20

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AD Number:
77-13-20
Document Type:
AD Final Rules
Docket Number:
Unknown
Subject Heading:
ROLLS ROYCE (1971), LTD Model Bristol Viper MK. 522 and MK. 601-22 Engines
Subject:
Fuel Shutoff Valve
Status:
Current
Citation:
This information is not available.
Citation Publish Date:
Effective Date:
08/01/1977
Make:
Rolls-Royce Limited, Bristol Engines Division
Model:
Viper Mk. 522 | Viper Mk. 601-22
Product Type:
Engine
Product Subtype:
Affected AD:
Superseded AD:
Affected By:
Superseded By:
Service/Office:
Office of Primary Responsibility:
CFR Part Reference:
Part 39
Comments:
AIRWORTHINESS DIRECTIVES FINAL RULES: 77-13-20
CITATION:   This information is not available.

PAGE NUMBER:  

DOCKET NUMBER:   Unknown

AMENDMENT:   39-2945

AD NUMBER:   77-13-20

SUBJECT HEADING:   ROLLS ROYCE (1971), LTD Model Bristol Viper MK. 522 and MK. 601-22 Engines

ACTION:  

SUMMARY:  

DATES:   Effective August 1, 1977.

ADDRESSES:  

FOR FURTHER INFORMATION CONTACT:  

SUPPLEMENTARY INFORMATION:  

REGULATORY TEXT:  
77-13-20 ROLLS ROYCE (1971), LTD: Amendment 39-2945. Applies to Bristol Viper MK. 522 and MK. 601-22 engines installed, or being held for installation, on Hawker Siddeley Model DH/BH-125 series airplanes, certificated in all categories.

Compliance is required as indicated, unless already accomplished.

To prevent interference between the engine throttle control rod and the high pressure fuel shutoff valve that could result in inability to actuate fuel shutoff, accomplish the following:

(a) For installed engines, within the next 500 hours engine time in service after the effective date of this AD, accomplish the following in accordance with paragraph 2.A of Rolls Royce Alert Service Bulletin 73-A98 (MK. 522 engines) or 73-A13 (MK. 601-22 engines), both dated October 1975, or an FAA-approved equivalent:

(1) Relocate the ident/data tags fitted to the fuel tube, P/N DF-21-389.

(2) Check for adequate clearance between the fuel tube, P/N DF-21-389, and the H.P. cock control rod, P/N 25CX53-25A.

(3) If the clearance is found not to be adequate during the inspection specified in paragraph (a)(2) of this paragraph, realign the fuel tube to provide adequate clearance.

(b) For other engines, prior to installation on a Model DH/BH-125 airplane, ascertain the location of the ident/data tags on fuel tube P/N DF-21-389 and if it is found to be within 8 inches or less of the union nut, at the b.f.c.u. connection, remove the tags and refit to a lower position on the tube in accordance with the instructions contained in paragraph 2.B of Rolls Royce Alert Service Bulletin 73-A98 (MK. 522 engines) or 73-A13 (MK. 601-22 engines), both dated October 1975, or an FAA-approved equivalent.

NOTE: The accomplishment instructions contained in Rolls Royce Alert Service Bulletins 73-A13 and 73- A98 are identical.

This amendment becomes effective on August 1, 1977.

FOOTER: