Table 5-2.-Sequencer Timings
Altitude (ft)
0 – 8 K
8K—18K
18K+
KEAS
0—350 350—500 500-600 ALL
ALL
MODE
1
2
3
4
5
1
2
3
4
5
6
7
8
Gas pressure from seat initiator cartridges,
delay cartridge or command sequencing
system initiates catapult and thermal batteries
Start switches close after 39 inches of seat
travel
Sequencer supplies dual pulse to fire drogue
deployment catapult
Sequencer supplies dual pulse to fire drogue
bridle release cartridge and release drogue
bridle
Sequencer supplies dual pulse to fire parachute
deployment rocket
Sequencer supplies dual pulse to fire drogue
bridle release cartridge and release drogue
bridle
Sequencer supplies dual pulse to fire barostatic
release unit cartridge and release harness locks
Sequencer supplies dual pulse to fire barostatic
release unit cartridge backup)
0.00
0.18
0.22
0.32
0.45
—
0.65
0.66
0.00
0.18
0.22
—
1.10
1.25
1.30
1.31
0.00
0.18
0.22
—
1.30
1.45
1.50
1.51
0.00
0.18
0.22
—
2.90
3.05
3.10
3.11
0.00
0.18
0.22
4.80 +t
(See Note 3)
4.87 +t
5.07 +t
5.08 +t
NOTES TO TABLE 5-2
1. All times are referenced to seat catapult initiation. To obtain times referenced to sequencer start
switches, subtract 0.18 sec.
2. Mode selection environmental sensing takes place between 0.245 sec and 0.305 sec (8 microprocessor
cycles).
3. In Mode 5 operation, altitude sensing recommences at 4.80 see, continuing until the seat falls to
18000 ft. ´t´ = time interval between 4.80 sec and falling to 18000 ft.
4. Mode decision parameter values are stored in the on-board NOVRAM.
5-36
