TM 1-1510-218-10 8-3 12.  Battery switch – OFF. O 13.  Galley power switches – OFF. 14.  Electric toilet – Check condition and that knife valve is open approximately 1/8 inch. Chapter 2 provides information for servicing during freezing temperatures. 15.  Emergency equipment – Check that all required emergency equipment is available and that two fire extinguishers and three first-aid kits have current inspection dates. 8-13.  FUEL SAMPLE. CAUTION A  cold  oil  check  is  unreliable.    Oil  should be checked within 10 minutes after stopping  engine.    If  more  than  10  minutes have elapsed, motor engine for 40 seconds then  recheck.    If  more  than  10  hours  have elapsed,   run   engine   for   2   minutes,   then recheck.      Add   oil   as   required.      Do   not overfill. NOTE Fuel     and     oil     quantity     check     may     be performed     prior     to     exterior     check     to preclude  carrying  ladder  and  fuel  sample container   around   during   the   inspection. 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. Refer to Chapter 2 for locations. NOTE All  exterior  check  areas  are  illustrated  in Figure 8-1. 8-14.  LEFT WING, AREA 1. 1.   Left wing area – Check. * a.   General    condition    –    Check    for    skin damage    such    as    buckling,    splitting, distortion, dents, or fuel leaks. b.   Flaps – Check for full retraction/extension    (approximately  1/4- inch   play)   and   skin   damage   such   as buckling, splitting, distortion, or dents. c.   Fuel sump drains – Check for leaks. d.   Controls  and  trim  tab  –  Check  security and trim tab rig. e.   Static    wicks    –    Check    security    and condition. f.    Wing   tip   and   position   lights   –   Check condition and for cracked lens. g.   Recognition light – Check condition. h.   Landing/taxi light – Check condition. i.    Outboard wing fuel vent – Check free of obstruction and leaks. * j.    Main tank fuel and cap – Check fuel level visually,  condition  of  seal,  and  cap  tight and properly installed.  Locking tab aft. k.   Outboard deice boot – Check for secure bonding,    cracks,    loose    patches,    stall strip, and general condition. l.    Stall warning vane – Check free. * m. Tiedown – Released. n.   Wing ice light – Check condition. o.   Recessed and heated fuel vents – Check free of obstruction and leaks. 2.    Left main landing gear – Check. * a.   Tires  –  Check  for  cuts,  bruises,  wear, appearance   of   proper   inflation,   wheel condition, and that both tires have same tread design. b.   Brake assembly – Check brake  lines  for damage  or  signs  of  leakage  and  brake linings for wear.  Also check brake deice assembly     and     bleed     air     hose     for condition and security. * c.   Shock strut – Check for signs of leakage, minimum   strut   extension   (4   inches   C, 5.5 inches D), and that left and right strut extension is approximately equal. d.   Torque knee – Check condition. e.   Safety  switch  –  Check  condition,  wire, and security. H f.    Fire    extinguisher    pressure    –    Check pressure within limits. Refer to Chapter 2. g.   Wheel  well,  doors,  and  linkage  –  Check for signs of leaks, broken wires, security, and general condition. h.   Fuel  sump  drains  (forward)  –  Check  for leaks.