TM 1-1510-224-10 (b) Warmup Allow two minutes. (c) Mode I and mode 3/A codes Set. (d) Lamp indicators Press to test. (e) Antenna switch Select TOP. (f) Mode selector NORM. (g) Modes  1,  2,  3/A,  and  C  Hold  to TEST and observe GO light. (h) Antenna  switch  Select   BOT  and repeat step (g). (i) Antenna  switch  Select    DIV   and repeat step (g). (j) Mode     4     Hold     to     TEST and observe    GO   light   (if   code   has been set in external computer). 27. BATTERY switch As required. 28. Toilet Check condition. 29. Emergency   equipment   Check   that   all   required emergency  equipment  is  available  and  that  fire extinguishers     and     first-aid     kits     have     current inspection date. O   30. Parachutes Check. 8-10.  FUEL SAMPLE AND OIL CHECK. NOTE Fuel   and   oil   quantity   check   may   be performed    prior    to    exterior    check. During  warm  weather,  open  fuel  cap slowly   to   prevent   being   sprayed   by fuel under thermal pressure. *1. Fuel sample Check collective fuel sample from all drains    for    possible    contamination.        Thru-flight check    is    required    only    if    aircraft    has    been refueled. 8-11.  EXTERIOR CHECK. a. Left Wing Area.  Check as follows (fig.  8-1): 1. Left wing Check. *a. General condition Check. b. Flaps Check for full retraction (approximately   0.25   inch   play)   and skin damage, such as buckles, splits, dents, or distortion. c. Fuel sump drains Check for leaks. d. Aileron  and  movable  trim  tab  Check security and trim tab rig. e. Outboard   wing   fuel   vent   (in   aileron cove) Check free of obstruction. f. Static   wicks   (4)   Check   security   and condition. g. Wing     pod,     navigation     lights,     and deice boots Check condition and pod tip latches closed. h. Recognition light Check condition. i. Outboard antennas Check condition. *j. Main   tank   fuel   and   cap   Check   fuel level   visually,   condition   of   seal,   and tap tight and properly installed. k. Outboard deice boot Check for secure bonding, cracks, loose patches, stall strip, and condition. i. Stall  warning  vane  Check  freedom  of movement. *m. Tiedown Released. n. Inboard   dipole   antenna   sets   Check for   security   and   cracks   at   mounting points. Check  bonding  secure,  boots  free  of cuts and cracks. o. Wing ice light Check condition. p. AC GPU access door Secured. q. Recessed     and     heated     fuel     vents Check free of obstructions. r. Inverter    inlet    and    exhaust    louvers Check free of obstructions. 2. Left main landing gear Check. *a. Tires Check condition. b. Brake assembly Check. c. Brake  deice  assembly  and  bleed  air hose Check for condition and security. *d. Shock strut Check for signs-of leakage,    minimum    strut    extension (5.5   inches),   and   that   left   and   right strut extension is approximately equal. e. Torque links Check condition. f. Safety  switch  Check  condition,  wire, and security. g. Wheel, well, doors, and linkage Check 8-9