AD 82-07-03 SUPERSEDED

82-07-03 JANITROL AERO DIVISION (MIDLAND-ROSS CORPORATION): Amendment 39-4354. Applies to Models B1500, B2030, B3040, and B4050 combustion heaters marked as meeting the standards of FAA TSO-C20, installed in aircraft certificated in any category.

COMPLIANCE: Required as indicated, unless already accomplished.

To detect and prevent the failure of affected combustion heater tube assemblies, accomplish the following:

a) For installed affected heaters with 450 or more heater-hours time-in-service, since last overhauled or installed new, on the effective date of this AD, comply with paragraph e) within the next fifty (50) heater-hours time-in-service or twelve (12) months from effective date of this AD, whichever occurs first, and thereafter at intervals not to exceed 100 heater-hours time-in-service or twenty-four (24) months, whichever occurs first.

b) For installed affected heaters with less than 450 heater-hours time-in-service, since last overhauled or installed new, on the effective date of this AD, comply with paragraph e) before the accumulation of 500 heater-hours time-in-service since last overhauled or installed new, or twelve (12) months from effective date of this AD, whichever occurs first, and thereafter at intervals not to exceed 100 heater-hours time-in-service or twenty-four (24) months, whichever occurs first.

c) For uninstalled out-of-service/overhauled heaters without a new combustion tube assembly that are installed in aircraft subsequent to the effective date of this AD, comply with paragraph e) before the accumulation of 250 heater-hours time-in-service or twelve (12) months, whichever occurs first, and thereafter at intervals not to exceed 100 heater-hours time-in-service or twenty-four (24) months, whichever occurs first.

d) For uninstalled affected new or overhauled heaters with a new combustion tube assembly that are installed in aircraft subsequent to the effective date of this AD, comply with paragraph e) beforethe accumulation of 500 heater-hours time-in-service or twenty-four (24) months, whichever occurs first, and thereafter at intervals not to exceed 100 heater-hours time-in-service or twenty-four (24) months, whichever occurs first.

e) Conduct 100 hour inspection of affected heaters in accordance with Janitrol's Maintenance and Overhaul Manual, Instruction P/N 24E25-1, dated October 1981. Prior to further flight, overhaul any heater that does not pass the combustion pressure decay test required by this inspection.

For all affected Janitrol Aircraft Heaters installed in Cessna or Piper Aircraft, conduct the required overhaul in accordance with the appropriate Cessna or Piper Aircraft Heater Overhaul Manual or Janitrol Overhaul Manual, P/N 24E25-1, dated October 1981.

f) A HEATER HOURMETER may be used to establish heater operating time. If a HEATER HOURMETER is not used, count one (1) heater hour for each two (2) flight hours for normal aircraft flight operation.

g) Upon request of an operator, the Chief, Chicago Aircraft Certification Office, FAA, Central Region, may adjust the compliance time specified in paragraphs a), b), c), and d) of this AD provided such requests are made through an FAA maintenance inspector, and the request contains substantiating data to justify the request for that operator.

h) An equivalent method of compliance with this AD may be used when approved by the Chief, Chicago Aircraft Certification Office, FAA, 2300 East Devon Avenue, Des Plaines, Illinois 60018; telephone (312) 694-7357.

This AD supersedes AD 80-09-10.

This amendment becomes effective May 6, 1982.