AD 84-14-01

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AD Number:
84-14-01
Document Type:
AD Final Rules
Docket Number:
Unknown
Subject Heading:
AVCO LYCOMING Model LTS101-600A-2 Engines
Subject:
T4 Indicator System Check
Status:
Current
Citation:
This information is not available.
Citation Publish Date:
Effective Date:
Make:
Honeywell International Inc.
Model:
LTS101-600A-2
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Superseded AD: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Superseded By: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:
Updated RGL applicability to match AD applicability; CAR C-11-185
AIRWORTHINESS DIRECTIVES FINAL RULES: 84-14-01
CITATION:   This information is not available.

PAGE NUMBER:  

DOCKET NUMBER:   Unknown

AMENDMENT:  

AD NUMBER:   84-14-01

SUBJECT HEADING:   AVCO LYCOMING Model LTS101-600A-2 Engines

ACTION:  

SUMMARY:  

DATES:  

ADDRESSES:  

FOR FURTHER INFORMATION CONTACT:  

SUPPLEMENTARY INFORMATION:  

REGULATORY TEXT:   84-14-01 AVCO LYCOMING: Letter issued July 20, 1984. Pursuant to the authority of the Federal Aviation Act of 1958, delegated to me by the Administrator, the following AD is issued and made applicable to Avco Lycoming LTS101-600A-2 model engines.
Compliance required in the sequence indicated, unless already accomplished:
1. Perform a T4 indicator system check on those AS350D helicopters having Brion Leroux T4 indicator part number 5626-524-00-00 installed, in accordance with Aerospatiale Maintenance Manual Maintenance Work Card (MWC) 77.00.00.501 at four approximately equal increments between 680 degrees C and 820 degrees C, within the next 50 engine operating hours and thereafter at intervals not to exceed 300 engine operating hours.
(NOTE: Approved calibration equipment is described in Aerospatiale Telex Number AHC/SE/BH/84T/114T, paragraph EE.) Comply with following instructions (A), (B), and (C) if the T4 indicator system error is greater than zero plus minus 5 degrees C at any of the four increments and comply additionally with paragraph 4 below prior to further flight if the T4 indicator system reads low by 15 degrees C or greater at any of the four increments.
(A) Check that the thermocouple loop resistance (without indicator) is not greater than 5.7 OHMS.
(B) If the thermocouple loop resistance (without indicator) is greater than 5.7 OHMS, check the harness for loose or contaminated connections. Tighten, clean, or replace the aircraft harness components, or check and replace engine thermocouple components as required to bring the resistance to 5.7 OHMS or less.
(C) When the thermocouple loop resistance (without indicator) is 5.7 OHMS or less, calibrate the T4 indicator system to result in zero plus minus 5 degrees C error at a selected point within the range of 760 degrees C to 770 degrees C, by adjusting the indicator setscrew (reference MWC 77.00.00.501) or replacing the indicator if required.
2. Perform an engine condition check in accordance with the Aerospatiale AS350D helicopter flight manual, Section II, paragraph 10, within the next 50 engine operating hours. If the condition of the engine is proved to be unsatisfactory and cannot be corrected through normal maintenance procedures, comply with paragraph 4 below prior to further flight.
3. Perform an engine vibration survey in accordance with Avco Lycoming Service Bulletin Number LTS 101A-71-00-0061, Section II, Item B, within the next 50 engine operating hours. If the revised vibration limits are exceeded, comply with paragraph 4 below prior to further flight.
4. Comply with the accomplishment instructions in Avco Lycoming Service Bulletin Number LTS 101A-71-00-0061, Section II, Items F, G, H, and I, at each 600 hour periodic inspection and prior to further flight as directed by the preceding paragraphs.
Aircraft may be ferried in accordance with the provisions of Federal Aviation Regulations (FAR) 21.197 and 21.199 to a base where the AD can be accomplished. Upon request of an operator, an equivalent means of compliance with the requirements of this AD may be approved by the Manager, Engine Certification Office, FAA, New England Region.
This airworthiness directive becomes effective upon receipt.

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