TM 9--1370-202-12
(3) Distinct metallic click, followed by hissing
Table 3-2. Distance of Fall for Fuze Settings Prior to
and odor similar to rotten eggs, indicates fuze has been
Flare Ignition (feet)
activated. In such case, have personnel clear arming
area for at least five minutes, or until flare has burned
out completely.
NOTE
Setting fuze between 5-second
intervals will result in duds.
(4) Do not permit tape to overlap weather
cap.
NOTE
(5) Do not route static line through
Height values are calculated on
suspension bands or lugs.
(6) Require crewmen engaged in manual
mean delay time of fuze settings.
launch operations to wear harness and be secured to
aircraft by safety line.
(1) When height of desired flare ignition and
(7) During normal operation fully extended
launch altitude are known, determine fuze setting as
safety lanyard will automatically disconnect from static
follows:
line. If this does not occur, immediately disconnect
(a) Subtract height of desired flare
safety lanyard from the aircraft and let it fall away.
ignition from launch altitude.
(8) Do not use bent or damaged cotter/safety
(b) Using this number, read ejection
pins.
fuze setting and ignition fuze setting.
(9) Firing temperature limits are 160 and
F
(2) When fuzes on flare have been preset
65F.
and altitude of desired flare ignition is known, determine
launch altitude as follows:
CAUTION
(a) Find ejection fuze setting and
Have flares armed and installed by
ignition fuze setting on table. Read distance of fall at
trained, experienced personnel
intersection of fuze setting columns.
only.
(b) Add distance of fall to desired
ignition altitude to determine launch altitude.
b. Preparation for Use.
To obtain maximum
usable illumination, fuzes should be set to assure
(3) When fuzes on flare have been preset
burnout before flare impacts. Unless they are entirely
and aircraft's altitude is known, determine altitude of
burned out and cool on landing, flares are also likely to
flare ignition as follows:
ignite combustible materials. Safe launch heights are
(a) Obtain distance of fall as in (2)(a),
dependent on burning time, fuze settings, rate of
above.
descent, and drift of flare. Fuze settings can be
(b) Subtract distance of fall from launch
determined from data in tables 3-1 and 3-2.
altitude to obtain ignition altitude.
(1) Preparation arming trough and area.
3-8. Operation under Usual Conditions
(a) The arming trough (fig. 3-6) is
This paragraph covers preparation of flares for launch,
designed to hold the flare in a horizontal position during
stowage on aircraft, and launching techniques for both
arming procedures. In case of accidental functioning,
fixed-wing and rotary-wing aircraft.
the trough accomplishes the following:
a. Precautions.
(1) Prevents backward movement of flare.
(2) Propels candle and parachute assembly
(1) Assure that lanyard does not foul. Pull of
forward into specific, programmed burnout area.
only 12 pounds on lanyard will fire ejection delay
(3) Retains flare case in place.
plunger with ejection fuze set on SAFE. This makes
(b) The trough can be easily constructed in the field as
flare nonfunctional.
follows:
(2) If ejection fuze is not set on SAFE, pull on
1. Build
trough
(dimensions
to
lanyard will eject contents and propel flare case away.
accommodate complete cased flare) from wood or
This creates a missile hazard. If ignition fuze is not set
metal in either V-shaped or rectangular design.
on SAFE, fire hazard is created.
2. Attach stop plate to end of arming
trough which will hold fuzed end of flare.
3-7
