Airplane General - Passenger Cabin Signs
The passenger cabin signs are controlled by overhead panel selectors. The passenger signs illuminate when the following conditions are satisfied:
FASTEN SEAT BELTS
AUTO: The FASTEN SEAT BELTS signs illuminate if:
- Landing Gear not up and locked, or
- Flap Lever not UP, or
- Cabin Altitude above 10,000 ft or
- Passenger Oxygen ON
OFF: The FASTEN SEAT BELTS signs illuminate if:
- Cabin Altitude above 10,000 ft or
- As Installed: Passenger Oxygen ON
NO SMOKING
AUTO: The NO SMOKING signs illuminate if:
- Landing Gear not up and locked or
- Cabin Altitude above 10,000 ft or
- Passenger Oxygen ON
OFF: The NO SMOKING signs illuminate if:
- Cabin Altitude above 10,000 ft or
- As Installed: Passenger Oxygen ON
RETURN TO SEAT
RETURN TO SEAT signs are illuminated with the FASTEN SEAT BELTS signs, except when:
- As Installed: Cabin Altitude above 10,000 ft
- As Installed: Passenger Oxygen ON
All passenger signs can be controlled manually by positioning the respective selector to ON or OFF.
Note: Anytime Passenger Oxygen is deployed, the NO SMOKING and FASTEN SEAT BELTS illuminate, regardless of selector position.
When the passenger signs illuminate or extinguish, a low tone sounds over the PA system.
