99M90
21-40-01
Page: 6-1
Rev. New
Issued: May 9, 2012
I-Series Combustion Heater
Owners Manual
Chapter 6
TESTING
6.0
General
WARNING:
THERE ARE NO OWNER/OPERATOR MAINTENANCE ACTIVITIES
PERMITTED ON HET COMBUSTION HEATERS.
THE FOLLOWING
TESTING PROCEDURES MUST BE ACCOMPLISHED BY A QUALIFIED
LICENSED MECHANIC OR REPAIRMAN FAMILIAR WITH AIRCRAFT
HEATING SYSTEMS.
FAILURE TO OBSERVE THIS WARNING MAY
COMPROMISE THE COMPONENT OR THE APPLICATION IT IS USED IN.
IMPROPER TESTING MAY RESULT IN DEATH, SERIOUS BODILY
INJURY, AND/OR SUBSTANTIAL PROPERTY DAMAGE.
This chapter gives the tests and inspections required to help determine the condition of the heater
removed for scheduled or unscheduled maintenance.
Refer to the procedures given in the
TROUBLESHOOTING Chapter 3 prior to applying any test for unscheduled maintenance. For any
overhaul activity or maintenance not covered in this manual, consult the HET P/N 99M91 Overhaul
and Maintenance manual.
All testing activities must be accomplished by properly licensed
mechanics or repairmen experienced in aircraft/rotorcraft heating systems
6.1
Testing
A.
Equipment
1.
Standard tools
- Standard mechanic's handtools.
- Torque wrench pound/inch (newton/centimeter)
- Torque wrench pound/foot (newton/meter)
- Air compressor (shop air)
2.
Safety Equipment
- Safety gloves
- Protective goggles (eye protection).
- Ear Plugs (hearing protection)
- Safety shoes
- Protective cotton apron
3.
Special tools
Special tools used in this chapter, are identified by description and as may be
listed in SPECIAL TOOLS, EQUIPMENT, AND FIXTURES.
- Heater Pressure Decay Test kit (26E24-1)
(or Pressure Decay Tester, P/N PDT 285B or P/N PDT 286B).
4.
Instruments
- A multimeter, (Simpson 260 or Triplett 630) or equivalent (accuracy 1%).
- An ammeter, (min. 250 amp rating).
- Zero to 30 volt power supply.
- Optical or Mechanical tachometer.
5.
Test conditions
- Ambient temperature: 70 to 80
o
F (21 to 27
o
C).
