A - Safety Switch  B- Mechanic’s Signal  C - Forwar~  Air Damper  D - Forward Air Valve, Open  E - Aft Air Valve, Open  F - Aft Air Damper, Close  G - "Forward Air Valve, Close  R  - Aft Air Valve, Close  I, J,  K,  L- Fuel Dumping  M - Port Helium Valve, Close  N - .Port Helium Valve, Open  0 - Stlbd Helium Valve, Close  P- St’bd.Helium Valve, Open  Q, R - Slip Tanks  ~  (!)Q)fi@  fi@  •Fig. XI - Flight and Instrument Panel  -42-