Hartzell CD15K - 7. ICA (INSTRUCTIONS FOR CONTINUED AIRWORTHINESS); 7.1. PREFLIGHT;OPERATIONAL CHECK AND SHUTDOWN PROCEDURE; 7.1.1. Ensure that combustion and ventilation air inlets are free of any obstructions or constrictions and are not damaged.; 7.1.2. Check that the fuel drain line is free of obstructions, constrictions and damage.

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MM10001
Dated 1/1/08
Rev L dated 5/21/15
7. ICA (INSTRUCTIONS FOR CONTINUED AIRWORTHINESS)
Second Edition: Rev E dated 5-21-15
When Hartzell Engine Technologies LLC (HET) heater is installed in an aircraft, the following action is
required. A description of its operational principals, controls, servicing, maintenance, troubleshooting and
testing can be found in the attached MM10001 maintenance manual in the “Table of Contents.”
APPLICATION
Applies to HET Model #CD15K, CD25K, CD35K, CD45K, CD50K, CD55K and CD70K with part
number ending in “–1”. Combustion heaters marked as meeting the standards of FAA TSO-C20, installed
in aircraft certified in any category.
7.1. PREFLIGHT/OPERATIONAL CHECK AND SHUTDOWN PROCEDURE
NOTE: Pilots operating under FAR91 may perform the checks required
7.1.1. Ensure that combustion and ventilation air inlets are free of any obstructions or
constrictions and are not damaged.
7.1.2. Check that the fuel drain line is free of obstructions, constrictions and damage.
7.1.3. Check that the area of the aircraft external skin surface behind the exhaust pipe does not
have indications of excess exhaust slip stream build up.
7.1.4. Perform operational check
7.1.5. Adjust the thermostat or duct limit switch to the minimum setting.
7.1.6. After heater has begun to burn, allow it to cycle a minimum of two minutes to ensure
proper operation in low. Verify medium and high positions also function.
7.1.7. Verify during operation that the exhaust from the heater does not indicate excess smoke.
7.1.8. Prior to shut down, set thermostat to low (cold) and/or fan position. Allow heater to run at
this setting two minutes so as to purge the combustion chamber.
Note: Many “-1” series heaters are equipped with auto-reset overheat switches. If overheat
condition occurs, continue cool down process until automatic reset occurs. (around 100 °F)
7.2. AIRWORTHINESS LIMITATION SECTION (MANDATORY)
The Airworthiness Limitations section is FAA approved and specifies maintenance required under
43.16 and 91.403 of the Federal Aviation Regulations unless an alternative program has be FAA
approved.
AIRWORTHINESS LIMITATION SECTION IS MANDATORY PER FAR 23
PERFORM FOLLOWING CHECKS AS OUTLINED IN THE CIRCUMFERENCE OF THIS
MM10001 MAINTENANCE MANUAL
1. 100 HOUR/ANNUAL OPERATIONAL CHECK (see MM10001 (latest revision) ‘Heater
Maintenance and Servicing’ Section.)
2. 250-HOUR/2 YEAR SERVICE AND INSPECTION (see MM10001 (latest revision)
‘Heater Maintenance and Servicing’ Section.)
3. 1000-HOUR/4 YEAR HEATER INSPECTION AND SUBSEQUENT 250-HOUR/PDT
TEST INTERNAL INSPECTION (see MM10001 (latest revision) ‘Heater Maintenance
and Servicing’ Section.
4. 2000-HOUR/10 YEAR OVERHAUL [to be accomplished in accord with MM10001
(latest revision)]