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MM10001
Dated 1/1/08
Rev L dated 5/21/15
8 HEATER MAINTENANCE AND SERVICING
NOTE: Prior to servicing, verify you are using the latest revision of the HET MM10001 Maintenance
Manual. Please consult www.hartzell.
aero for latest revisions.
Many hours have been spent to provide the most comprehensive instructions as reasonably possible. It is
strongly recommended that installation and servicing be done by skilled, licensed aircraft mechanics with a
working knowledge of the following:
Fuel lines installed in accordance with AC43.13-1B Chapter 8 section 2 paragraph 8-31.
Electrical installation completed in accordance with AC43.13-1B Chapter 11.
Riveting and metal work in accordance with AC 43.13-1B Chapter 4 Section 4 paragraph 4-57.
The following instructions are outlined and worded with this assumption.
8.1 REMOVAL AND INSTALLATION PROCEDURES
NOTE: Use of Teflon products as a fitting sealer anywhere in a combustion heater fuel system could
contaminate heater fuel nozzle and voids warranty.
NOTE: It is also highly recommended that the fuel system and delivery lines be purged prior to being
connected to heater. This applies to new installations as well as during maintenance involving
any fuel system component. This will greatly reduce the risk of nozzle contamination.
8.1.1 Follow the aircraft manufacturers (OEM) recommendations in the OEM’s maintenance
manual. In most cases the heater operating controls remain the same. If not, operation
will be clarified in the FAA-Approved “Airplane Flight Manual Supplement” provided
for the specific aircraft.
8.1.2 Where deviation from the original heater controls are required the installation instructions
provided with the Hartzell Engine Technologies LLC (HET) heater will address these
changes. Refer to appropriate installation instructions.
8.1.3 For new HET TSO-C20 Supplemental Type Certificate (STC’d) heater kits, the
installation instructions from HET will contain complete procedures for operation and
integrating in the aircraft.
8.1.4
To achieve optimal performance and reliability some new HET FAA-
PMA heater installations require change to the combustion air inlet.
Please follow all instructions specific to your installation closely.
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