AD 70-15-04

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AD Number:
70-15-04
Document Type:
AD Final Rules
Docket Number:
Unknown
Subject Heading:
Airworthiness Directives; Handley Page Model HP-137 Mark I Airplanes
Subject:
Relocating Fuel and Hydraulic Valves
Status:
Current
Citation:
This information is not available.
Citation Publish Date:
Effective Date:
11/13/1972
Make:
British Aerospace Regional Aircraft
Model:
H.P. 137 Jetstream Mk. 1
Product Type:
Aircraft
Product Subtype:
Small/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Superseded AD: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Superseded By: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: 70-15-04
CITATION:   This information is not available.

PAGE NUMBER:  

DOCKET NUMBER:   Unknown

AMENDMENT:   39-1556

AD NUMBER:   70-15-04

SUBJECT HEADING:   Airworthiness Directives; Handley Page Model HP-137 Mark I Airplanes

ACTION:  

SUMMARY:  

DATES:   Effective November 13, 1972.

ADDRESSES:  

FOR FURTHER INFORMATION CONTACT:  

SUPPLEMENTARY INFORMATION:  

REGULATORY TEXT:  
70-15-04 HANDLEY PAGE: Amdt. 39-1031 as amended by Amendment 39-1317 is further amended by Amendment 39-1556. Applies to all HP-137 Mark I airplanes having Turbomeca Astazou XIV series engines installed.

To reduce the possibility of inflight failure of the first stage engine turbine disc and subsequent rupture of fuel and hydraulic lines, accomplish the following:

(a) Before further flight, except that the airplane may be flown in accordance with FAR 21.197 to a base where the modification can be performed, modify the fuel and hydraulic systems by relocating the fuel and hydraulic shutoff valves from the engine nacelles to a location on the front spar inboard of the nacelle in accordance with a modification approved by the engineering and manufacturing branch of the nearest FAA regional office.

(b) For first stage turbine discs, P/N 0.261.25.013.0, installed on engines that do not incorporate Turbomeca Mods. TU-123, TU-124, and TU-126, before the accumulation of 400 hours total disc time in service or 1,000 cycles, whichever occurs sooner, remove the first stage turbine disc from service and replace it with a new disc of the same part number.

(c) For first stage turbine discs, P/N 0.261.25.013.0 installed with less than 100 hours' time in service since new on engines that incorporate Turbomeca Mods. TU-123, TU-124, and TU-126, installed in accordance with Turbomeca Service Instructions No. 0123, dated August 27, 1970, No. 0124, dated September 16, 1970, and No. 0127, dated September 16, 1970, respectively, or FAA-approved equivalents, before the accumulation of 750 hours total disc time in service or 2,000 cycles, whichever occurs sooner, remove the first stage turbine disc from service and replace it with a disc of the same part number, which has less than 100 hours' time in service since new.

(d) For the purpose of complying with this AD, a cycle constitutes:

(1) Any takeoff and landing operation;
(2) Any touch and go landing operation;
(3) Any other operation where reduction of power is followed by application of takeoff power.

Amendment 39-1031 became effective upon publication in the Federal Register as to all persons except those persons to whom it was made immediately effective by the telegram dated May 15, 1970, which contained this amendment.

Amendment 39-1317 became effective October 5, 1971.
This Amendment 39-1556 becomes effective November 13, 1972.

FOOTER: