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TM 1-1500-323-24-2
161. CRIMP REMOVABLE CONTACT CONNEC-
The MCH-100-A heat gun has been
TOR BUILD-UP.
electromagnetic interference (EMI) qualified
for flight line or flight deck use. All other
162. Connector build-up is the process of assembly
electric motor type heat guns are not authorized
to the point of usability, and falls into different
for flight line or flight deck use due to
categories. Each of these categories will be explained
electromagnetic interference (EMI). The electric
along with the applicable procedural steps.
motor type heating tools are safe for use by
personnel at the organizational maintenance
163. GENERAL WARNINGS AND C AUTIONS.
level to repair aircraft wiring in a hangar or
Before proceeding with maintenance, repair, or
hangar deck / flight line environment,
installation, become familiar with the following
provided the aircraft meets the gas-free
warnings, cautions, and notes as each of these are
environment criteria (NAVAIR 01-1A-35, or
pertinent throughout this section.
AF T.O. 1-1-3), and there are no EMI restrictions.
Do not perform wire repair while using
WARNING
explosive solvent/paint products on the
aircraft.
Isopropyl alcohol is highly flammable. Use
only with adequate ventilation. Avoid
When using a heat tool, do not use electrical
prolonged breathing of vapors.
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 HT-900B, HT-920B, HT-71002 and
area can result in asphyxiation.
MCH-100-A heat guns are the only authorized
heat guns to be used when working on aircraft
CAUTION
that have not been defueled and purged. The
aircraft must be defueled and purged before
Be careful if using metal tools (M81969). These
using any other heat guns listed in this manual.
tools can damage the wire sealing grommet in
the connector. Plastic tools are preferred.
Aircraft with open fuel cells or broken or open
Inspect tool tips for damage or distortion before
fuel lines shall be certified gas free in accordance
use. Damage to the connector wire sealing
with NAVAIR 01-1A-35, or AF T.O. 1-1-3. Only
grommet can occur.
the HT-900B/HT-920B, HT-71002, MCH-100-A
heating tools are authorized for use on any
Avoid using metal tooling to remove and install
aircraft whenever AVGAS, JP-4 or the presence
backshells. These tools can damage the
of any type of fuel is imposing an immediate
backshell and connector. Non-metallic tools
danger.
are designed to wear before damaging
connector or backshell.
When using heat guns with electric motors,
recertification may be required as work
Do not remove a contact attached to a broken
progresses, as directed by the Aviation Gas
wire with an unwired contact removal tool.
Free Engineering Technician (AVGFET).
The tool and connector may be damaged. Wire
strands may be encountered at any point up to
5
/16 inch of tool insertion. Do not force tool if
wire strands are encountered. Withdraw tool
any time it cannot be advanced into connector.
Inspect tool tip for nicks, cracks, mushrooming,
and other damage that will prevent proper
functioning. Replace removal tool and repeat
procedure if required.
