TM 55-1510-222-10 3. Gear   down   lights   illuminated   -   Check.   IF INDICATOR REMAINS UNSAFE: 4. Landing  gear  emergency  extension  - Per- form. WARNING If   for   any   reason   the   green   GEAR DOWN  lights  do  not  illuminate  (e.g., in    case    of    an    electrical    system failure), continue pumping until sufficient resistance is felt to ensure that   the   gear   is   down   and   locked. The landing gear cannot be manually retracted in flight. b. Landing Gear Emergency Extension. 1. Airspeed - Below 178 KIAS. 2. LANDING GEAR CONTROL circuit breaker - Pull. 3. Landing gear control switch - DN. 4. Alternate extension lever - Unstow. 5. Alternate  extension  lever  -  Pump  until  the three green gear down annunciators illuminate. 6. Alternate  extension  lever  -  Stow  (secure  in clip). c. Gear-up Landing. 1. Crew emergency briefing - Completed. 2. Loose equipment - Stowed. 3. Bleed air valves - PNEU ONLY. 4. Cabin pressure switch - DUMP. 5. Cabin    emergency    hatch    -    Remove    and stow. 6. Seat belt and harnesses - Secured. 7. Alternate   landing   gear   extension   handle   - Stowed. 8. LANDING GEAR CONTROL circuit breaker - In. 9. Gear - UP. 10. Nonessential electrical equipment - Off. 11. Flaps - As required (DOWN for landing). NOTE · Fly a normal approach to touchdown. Avoid touching down in a nose-high attitude. · Brakes  may  be  used  for  reducing landing    roll    and    for    directional control. 12. Power levers (runway assured) - IDLE. 13. Propeller levers - FEATHER. 14. Condition levers - FUEL CUTOFF. 15. Fire handles - Pull. 16. Master switch - OFF. 9-31.  CRACKED WINDSHIELD. a. Internal  Crack.    If  an  internal  crack  occurs, perform the following: 1. Descend - Below 20,000 feet. 2. Cabin pressure - Reset pressure differential to 4 PSI or less within 10 minutes. 9-32.  CRACKED CABIN WINDOW. If  crack(s)  in  a  cabin  window  ply(s)  occur,  perform  the following: 1. Crew   oxygen   masks   -   On   and   100%   (if above 10,000 feet). 2. Cabin pressure - Depressurize. 3. Land as soon as possible.  If both plys of a cabin window have developed cracks the air- craft shall not  be  flown,  once  landed,  without  proper  ferry  flight authorization. 9-33.  DITCHING. Landing should be made with full flaps and landing gear retracted.  Refer to Table 9-1 for pilot, copilot and ferry chair  occupant  actions.    Refer  to  figure  9-3  for  body positions  during  ditching.    Figure  9-4  shows  sea  swell information.    Refer  to  FM  20-151  for  techniques  to  be used during ditching. WARNING Do  not  unstrap  from  the  seat  until  all motion stops.  The possibility of injury and disorientation requires that evacuation  not  be  attempted  until  the aircraft comes to a complete stop. 9-12