Continental
Rev. 12/01/00 #29 Flight Manual
With airplane in the ground mode, the dual automatic system will start to pressurize the cabin when the throttles are positioned for takeoff and a 60-second timer is actuated. In the event of a rejected takeoff, the cabin will automatically begin to depressurize when the throttles are retarded. If airplane is not in the flight mode within 60 seconds after throttles are positioned for takeoff, the cabin will depressurize. When in the flight mode, cabin pressure is maintained automatically. During climb, cruise and descent the cabin will automatically climb, cruise and descend as programmed by the altitude schedule, which is a function of airplane altitude.
When the selected landing altitude is above the schedule, the cabin will climb to or hold at the selected landing altitude. If the landing altitude is set below actual field altitude, at airplane touchdown, a signal from the ground control relay will depressurize the cabin at a controlled rate for 20 seconds, at which time the cabin outflow valve will drive full open.
When operating on the pressure schedule, the cabin rate of climb will be proportional to airplane rate of climb with maximum limits as set by the rate limit knob. When climbing or descending toward a selected altitude above schedule, the cabin rate of change will be as selected on the rate limit knob. With the knob at the index mark, the rate limit is normally 700 FPM climb and 300 FPM descent.
The dual automatic pressurization system consists of two identical but independent systems, powered from different electrical sources, which are controlled by the cabin pressure selector panel. One system has primary control, while the other serves as a standby.
If either an automatic or manual transfer occurs prior to landing, it will result in lockout of any subsequent automatic transfer or system interchange after landing. The TRANSFR LOCKOUT and STDBY ON switch lights will be on and are not to be reset. This will assist maintenance in identifying which system requires fault isolation.
If performance of the standby system is not satisfactory, the primary system may be reselected by placing the system selector switch to STDBY and then back to PRIMARY. Manual selection between the two systems permits selection of the best performing system. Do not reset the TRANSFR LOCKOUT switch/light. With the TRANSFR LOCKOUT switch/light illuminated, any automatic transfer from the best selected system is inhibited.
Random electrical power impulses during ground operations may cause the TRANSFR LOCKOUT and STBY ON switch lights to come on necessitating that the switch lights be reset prior to takeoff.
Note: TRANSFR LOCKOUT and / or STBY ON switch lights coming on during
ground operation are not an indication of system failure unless
light(s) remain on after an attempt to reset.
AIR CONDITIONING AND PRESSURIZATION - COMPONENT LOCATION
MD-80
Continental
Rev. 12/01/00 #29 Flight Manual
AIR CONDITIONING AND PRESSURIZATION - COMPONENT LOCATION AIR CONDITIONING - CONTROLS AND INDICATORS
Continental
Rev. 12/01/00 #29 Flight Manual
AIR CONDITIONING - CONTROLS AND INDICATORS AIR CONDITIONING - CONTROLS AND INDICATORS
Continental
Rev. 12/01/00 #29 Flight Manual
AIR CONDITIONING - CONTROLS AND INDICATORS PNEUMATICS – CONTROLS AND INDICATORS
Continental
Rev. 12/01/00 #29 Flight Manual
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