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