When using a heat tool, do not use electrical
power from the aircraft being repaired. Use
electrical power from a ground power unit.
Do not perform hot work without specific
authorization of activity Aviation Gas Free
Use of nitrogen with the HT-900B/HT-920B
Engineer (AVGFE) or Gas Free Engineer(GFE).
heat gun in an enclosed area can be hazardous.
Discharge of nitrogen into a poorly ventilated
The HT900B, HT920B, HT71002 and MCH
area can result in asphyxiation.
100A heat guns are the only authorized heat
guns to be used when working on aircraft that
Do not let saddle, or clamps directly contact
have not been defueled and purged. The aircraft
cable or harness. The amount of tape used
must be defueled and purged before using any
must be at least one layer plus the amount
other heat guns listed in this manual.
needed to build up cable for a secure fit of
clamp to bundle when screws are tightened
Aircraft with open fuel cells or broken or open
and there is metal-to-metal contact.
fuel lines shall be certified gas free in accordance
with NAVAIR 01-1A-35, or AF T.O. 1-1-3. Only
For best results when applying silicone rubber
the HT-900B/HT-920B , HT71002, MCH100
tape, keep hands free of dirt and oil. When
A heating tools are authorized for use on any
assembly is completed leading edge of tape
aircraft whenever AVGAS, JP-4 or the presence
should protrude 1/8 inch through clamp.
of any type of fuel is imposing an immediate
White dot on adapter tool must be in line with
master key of connector before tool and
When using heat guns with electric motors,
connector are mated. Spinning adapter tool on
recertification may be required as work
to connector until it slips into place causes
progresses, as directed by the Aviation Gas
unnecessary wear on tools, keys, and keyways.
Free Engineering Technician (AVGFET).
When cutting heat-shrink sleeve with a sharp
The MCH-100-A heat gun has been
tool, do not nick or scrape wire insulation.
for flight line or flight deck use. All other
electric motor type heat guns are not authorized
for flight line or flight deck use due to
2. This work package (WP) covers connector
accessories used with MIL-DTL-38999 Series
motor type heating tools are safe for use by
connectors, their function, associated tools, assembly,
personnel at the organizational maintenance
and procurement information. A cross-reference of all
level to repair aircraft wiring in a hangar or
connector accessories for MIL-DTL-38999 connector
hangar deck / flight line environment,
series I thru IV is in Table 1.
provided the aircraft meets the gas-free
environment criteria (NAVAIR 01-1A-35, or
AF T.O. 1-1-3), and there are no EMI restrictions.
Do not perform wire repair while using
explosive solvent/paint products on the