AD 69-18-04

AD Final Rules - DRS_69-18-04.html
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AD Number:
69-18-04
Document Type:
AD Final Rules
Docket Number:
Unknown
Subject Heading:
ALLISON Models 250-C10 and 250-C18 Series Engines
Subject:
Torquemeter Shaftgear
Status:
Current
Citation:
This information is not available.
Citation Publish Date:
Effective Date:
10/18/1969
Make:
Rolls-Royce Corporation
Model:
250-C10 (T63-A-5) | 250-C10B (T63-A-5A) | 250-C10D (T63-A-700) | 250-C18 | 250-C18A | 250-C18B | 250-C18C
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Superseded AD: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Superseded By: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: 69-18-04
CITATION:   This information is not available.

PAGE NUMBER:  

DOCKET NUMBER:   Unknown

AMENDMENT:   39-860

AD NUMBER:   69-18-04

SUBJECT HEADING:   ALLISON Models 250-C10 and 250-C18 Series Engines

ACTION:  

SUMMARY:  

DATES:   Effective October 18, 1969.

ADDRESSES:  

FOR FURTHER INFORMATION CONTACT:  

SUPPLEMENTARY INFORMATION:  

REGULATORY TEXT:   69-18-04 ALLISON: Amdt. 39-860. Applies to Allison Models 250-C10 and 250-C18 Series Engines having Gearbox Serial Numbers CAG 20183; CAG 20185; CAG 20193 through CAG 20265; CAG 20508; CAG 21001 through CAG 21395; CAG 21600 through CAG 21706; CAG 21800 through CAG 21803 installed, except those engines modified in accordance with Allison Commercial Engine Bulletin 250 CEB-90, dated August 21, 1969, or later FAA approved revision, or having P/N 6852085 nitrided helical torquemeter shaftgears.
COMPLIANCE: Amendment 39-833 effective September 10, 1969.
To prevent torquemeter shaftgear failure, accomplish the following:
A) Adjust the N1 speed at ground idle so that N2 speed does not exceed 71% RPM. Allison Commercial Service Letter No. 250 CSL-34, dated August 4, 1969, or later FAA approved revision relates to this subject.
B) Avoid continuous operation at any flight or ground condition, other than during ground idle or practice autorotation, at engine power turbine speeds (N2) below 98% or above 102% RPM. Allison Commercial Service Letter No. 250 CSL-34, dated August 4, 1969, or later FAA approved revision relates to this subject.
*See footnotes.
This amendment becomes effective October 18, 1969.
*As a result of these operating restrictions, the Rotorcraft Flight Manual and certain powerplant instrument markings for the Bell Model 206A and Hughes Model 369 Series Helicopters in which the affected engines are installed may require revision or modification. The necessary information for such changes is available from the manufacturers of these helicopters.
Revision No. 1 dated September 24, 1969, to Allison Commercial Service Letter 250 CSL-34 and Allison Commercial Engine Bulletin 250 CEB-90 is a later FAA approved revision which relates to the subject matter of this airworthiness directive.

FOOTER: