TM 1-1510-218-10 8A-16 (14)   Disengage     AP    by    selecting    GA. Check  that  AP  disengages  and  FD commands  7°  nose  up,  wings  level attitude. 12.   Electric elevator trim – Check. a.   ELEV TRIM switch – On. b.   Pilot  and  copilot  trim  switches  –  Check operation. Operation    of    the    electric    trim    system should occur only by movement of pairs of switches.    Any  movement  of  the  elevator trim  wheel  while  pressing  only  one  switch element   denotes   a   system   malfunction. The   electric   elevator   trim   control   switch must    then    be    turned    OFF    and    flight conducted  by  operating  the  elevator  trim wheel manually.  Do not use autopilot. (1)   Pilot   and  copilot.     Check   individual element   for   no   movement   of   trim, then  check  proper  operation  of  both elements. (2)   Check pilot  switches  override  copilot switches  while  trimming  in  opposite directions and trim moves in direction commanded by pilot. c.   Check  pilot  and  copilot  trim  disconnects while activating trim. d.   ELEV   TRIM   switch   –   OFF   then   On. ELEC TRIM OFF annunciator extinguishes. H    *13.   Pressurization – Check and set. a.   BLEED AIR VALVES – Both ON/OPEN. b.   CABIN  ALT  –  Set  500  feet  lower  than field pressure altitude. c.   CABIN  PRESS  switch  –  TEST.    Cabin climb/descent gauge indicates a descent. d.   CABIN PRESS switch – Release.  Cabin climb/descent   gauge   indicates   a   climb, then stabilizes at zero climb. e.   Altitude    selector    –    Set    as    required. Pressure altitude plus 200 feet. 14.   CONDITION levers – As required. 15.   Ground Proximity Altitude Advisory System (GPAAS) – Check as follows: NOTE The  GPAAS  voice  advisory  must  produce an    operational    volume    at    the    lowest setting. a.   GPAAS   voice   advisory   VOL   control   – Full counterclockwise. b.   VOICE OFF switch-indicator – Extinguished. c.   Audio control panel – Set listening audio level. d.   VA FAIL annunciator light – Extinguished. e.   Radio altimeter DH SET control – Set to 200 feet. f.    Radio altimeter TEST switch – Press and hold.        "Minimum,    minimum"    will    be announced once followed by the illumination of the VA FAIL light. g.   Radio altimeter TEST switch – Release. h.   Repeat steps a through g on the copilot’s side. * 8A-31.  BEFORE TAKEOFF. 1.   AUTOFEATHER switch – ARM. 2.   BLEED AIR VALVES – As required. 3.   FUEL   panel   –   Check   fuel   quantity    and switches positions. 4.   Flight and engine instruments – Check. 5.   CABIN ALT – Set PA + 200 feet. 6.   Annunciator panels – Check. 7.   PROP levers – HIGH RPM. 8.   FLAPS – As required. 9.   Trim – Set. 10.   Avionics – Set. 11.   Flight controls – Check. H    12.   Departure briefing – Complete. 13.   CABIN SIGNS switch – As required. * 8A-32.  LINE UP. 1.   ICE & RAIN switches – As required. 2.   Altitude alerter – Check. 3.   Transponder/TCAS/Wx radar – As required. 4.   ENG AUTO IGN – ARM. WARNING