TM 10-1670-300-20&P
TO 14D1-2-469-2
NAVAIR 13-1-42
WARNING
Premature withdrawal of FF-2 Release arming cable
prior to reaching 2500 feet of altitude above desired
opening altitude will result in inaccurate time delay
and opening altitude
After calculating FF-2 Release opening altitude, the
minimum arming altitude (opening altitude plus
2500 feet) should be ascertained It is imperative
that all concerned parachutists and aircrew
members be aware of this minimum arming altitude
NOTE
When in use, FF-2 Release aneroid will release timing
mechanism to begin operating six seconds above the
altitude/millibar setting. With the example provided
above, the timing mechanism will start operation at 6
seconds or 1080 feet (180 feet per second rate of
descent times six seconds) above the 2500 feet (924
millibar) setting. 2500 plus 1080 equals 3580 feet
above surface of the drop zone
(6) Make appropriate log entries as follows
(a) Fill in date
(b) Under number of Jumps column, record number of operations Number 1 will always be used when
FF-2 Release is tested in test chamber, and each operation thereafter will be numbered consecutively 2
through 25
(c) Apply signature of individual cocking FF-2 Release
(d) Fill in unit designation
2-54
