Document ID: chunk:federal_register_of_legislation:F2019L01314:body:0:p2
Version: federal_register_of_legislation:F2019L01314
Segment Type: other
Provision Reference: 
Character Range: 2906–6127

million).

                  (2) If the heater fails any part of the test or check mentioned in paragraph 2 (1) of this AD, the heater must be:
                     (a) overhauled in accordance with Requirement 4 of this AD; or
                     (b) disabled in accordance with Requirement 5 of this AD; or
                     (c) replaced.
                3. PRESSURE SWITCH TEST
                  (1) Subject to paragraph 3 (3) of this AD, an operational test of the air pressure switch must be conducted in accordance with the combustion heater manufacturer's Overhaul and Maintenance Manual, as in force from time to time.
                  (2) If the switch fails the test mentioned in paragraph 3 (1) of this AD, the switch must be:
                     (a) disabled in accordance with Requirement 5 of this AD; or
                     (b) replaced.
                  (3) Compliance with Requirement 3 of this AD is not required if an air pressure switch P/N 94E42 is installed.
                4. OVERHAUL
                The heater and the associated airframe mounted components necessary for heater operation must be overhauled in accordance with the overhaul and maintenance manual for the particular model of combustion heater, as in force from time to time.
                5. DISABLE
                Subject to any minimum equipment list requirements or permissible unserviceabilities approved under regulation 37 of the Civil Aviation Regulations 1988 that are applicable to the aircraft, the heater must be disabled as follows:
                  (a) cap the fuel supply line;
                  (b) disconnect the electrical power and ensure that the connections are properly secured to reduce the possibility of electrical spark or structural damage;
                  (c) inspect and test to ensure that the cabin heater system is disabled and the cabin fans are operative;
                  (d) ensure that no other aircraft system is affected by this action;
                  (e) ensure there are no fuel leaks;
                  (f) fabricate a placard with the words "System Inoperative" and install the placard at the heater control valve within the pilot's clear view.
             Note 1:  Comply with Kelly Aerospace Power Systems Service Bulletin No. 25 (as in force at the date of this AD) for procedures to temporarily disable the heater.
             Note 2:  Permanent disablement of the heater will require approved modification data including internal inspection and functional tests before return to service of the aircraft.
             Note 3:  FAA AD 2004-21-05 Amdt 39-13826 is consistent with this AD.
Compliance:          1, 2 and 3. The actions in Requirements 1, 2 and 3 must be taken:
                  (a) unless previously accomplished in accordance with Requirements 1, 2 and 3 of AD/AIRCON/12 Amdt 4, by the earlier of the following after the effective date of this AD:
                     (i) 100 heater hours;
                     (ii) 12 months' time in service (TIS); and
                  (b) at intervals not exceeding the earlier of the following:
                     (i) 100 heater hours;
                     (ii) 24 months' TIS.
                4. The action