Post by LOU on Aug 5th, 2011 at 8:23pm
I'm not sure I know where I should start.... :o
I don't know where you got your information.
From the CS 727 manual...
COCKPIT APU START PROCEDURE
(1) BATTERY SWITCH. . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .ON (VOLTAGE 23.5 MIN)
(2) APU FIRE WARNING (IF FIRST FLIGHT OF DAY) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .TEST
- TEST PROCEDURE -
APU FIRE WARNING TEST (PRIOR TO APU START):
(a) APU AUTOMATIC SHUTDOWN SWITCH . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . .ARMED
(b) APU FIRE WARNING TEST-RESET SWITCH. . . . . . . . . . . . . . . . . . . . . . . . . . . .. . .”FIRE TEST” AND HOLD ONLY UNTIL THE FIRE WARNING LTS. ILLUMINATE (MAX 60 SEC.)
(c) APU FIRE WARNING TEST-RESET SWITCH. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .RESET
(d) APU FIRE WARNING TEST-RESET SWITCH. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .RESET
- END OF TEST PROCEDURE -
(3) AC METERS SELECTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .APU
(4) AIR CONDITIONING PACK SWITCHES
(IF NO ELECTRICAL POWER ON A/C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .OFF
The PACK switches are checked OFF to prevent high initial electrical loads from the pack cooling fans when APU of external power is connected.
(5) APU CONTROL PANEL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . CHECKED
(a) APU FIRE HANDLE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .CHECK IN
(b) APU AUTOMATIC FIRE SHUTDOWN SWITCH. . . . . . . . . . . . . . . . . . . . . . . . . . . CHECK ARMED
(c) GENERATOR FIELD BREAKER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .CLOSED
(6) APU MASTER SWITCH. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .ON
Check that APU light (S/O lower panel) illuminates. This light illuminates only if the #1 DC bus is energized, and therefore will not illuminate when the APU is being started from the battery alone.
(7) APU MASTER SWITCH. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .START
(8) APU CRANK LIGHT . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . ILLUMINATES
(9) MASTER SWITCH. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .RELEASE TO “ON”, UPON OBSERVING CRANK LIGHT
(a) APU CRANK LIGHT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .EXTINGUISHES
This indicates that the starter motor is de-energized. Light should extinguish in approx. 10 seconds. If APU crank light does not extinguish within 30 seconds after APU start initiation, terminate APU start by pulling APU FIRE switch.
(10) APU EXHAUST GAS TEMPERATURE INDICATOR. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .MONITOR
(11) Check for stabilized speed by observing APU generator frequency (approximately 400 CPS)
(12) ALL BUS TIE BREAKERS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . CLOSED
(13) VOLTAGE, FREQUENCY. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . CHECK WITHIN LIMITS
(14) APU GENERATOR BREAKER SWITCH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .CLOSE
Closing the APU GENERATOR BREAKER switch will trip the EXTERNAL POWER switch or the
engine-driven generator’s GEN BREAKERS, if either were supplying the bus.
(15) ESSENTIAL POWER SELECTOR. . . . . . . . . . . . . . . . . . . . .APU; CHECK ESSENTIAL POWER LIGHT OUT
The # 3 BUS TIE BREAKER must be CLOSED.
(16) VOLTAGE, FREQUENCY, AND AMPS. . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . CHECK UNDER LOAD
Electrical power during pre-flight throughout engine start is normally furnished by the APU. External power may be connected through the external power receptacle as an alternate source of electrical power.
Normal ground or flight operation is with the busses in parallel (BUS TIA BREAKERS CLOSED, lights out) and operating as a synchronous bus.
727 fuel panel:
PLEASE re-read the manuals.
You are mixing the fuel system with hydraulic pumps in system A & B???? :-?
Lou
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I don't know where you got your information.
From the CS 727 manual...
COCKPIT APU START PROCEDURE
(1) BATTERY SWITCH. . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .ON (VOLTAGE 23.5 MIN)
(2) APU FIRE WARNING (IF FIRST FLIGHT OF DAY) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .TEST
- TEST PROCEDURE -
APU FIRE WARNING TEST (PRIOR TO APU START):
(a) APU AUTOMATIC SHUTDOWN SWITCH . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . .ARMED
(b) APU FIRE WARNING TEST-RESET SWITCH. . . . . . . . . . . . . . . . . . . . . . . . . . . .. . .”FIRE TEST” AND HOLD ONLY UNTIL THE FIRE WARNING LTS. ILLUMINATE (MAX 60 SEC.)
(c) APU FIRE WARNING TEST-RESET SWITCH. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .RESET
(d) APU FIRE WARNING TEST-RESET SWITCH. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .RESET
- END OF TEST PROCEDURE -
(3) AC METERS SELECTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .APU
(4) AIR CONDITIONING PACK SWITCHES
(IF NO ELECTRICAL POWER ON A/C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .OFF
The PACK switches are checked OFF to prevent high initial electrical loads from the pack cooling fans when APU of external power is connected.
(5) APU CONTROL PANEL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . CHECKED
(a) APU FIRE HANDLE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .CHECK IN
(b) APU AUTOMATIC FIRE SHUTDOWN SWITCH. . . . . . . . . . . . . . . . . . . . . . . . . . . CHECK ARMED
(c) GENERATOR FIELD BREAKER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .CLOSED
(6) APU MASTER SWITCH. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .ON
Check that APU light (S/O lower panel) illuminates. This light illuminates only if the #1 DC bus is energized, and therefore will not illuminate when the APU is being started from the battery alone.
(7) APU MASTER SWITCH. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .START
(8) APU CRANK LIGHT . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . ILLUMINATES
(9) MASTER SWITCH. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .RELEASE TO “ON”, UPON OBSERVING CRANK LIGHT
(a) APU CRANK LIGHT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .EXTINGUISHES
This indicates that the starter motor is de-energized. Light should extinguish in approx. 10 seconds. If APU crank light does not extinguish within 30 seconds after APU start initiation, terminate APU start by pulling APU FIRE switch.
(10) APU EXHAUST GAS TEMPERATURE INDICATOR. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .MONITOR
(11) Check for stabilized speed by observing APU generator frequency (approximately 400 CPS)
(12) ALL BUS TIE BREAKERS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . CLOSED
(13) VOLTAGE, FREQUENCY. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . CHECK WITHIN LIMITS
(14) APU GENERATOR BREAKER SWITCH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .CLOSE
Closing the APU GENERATOR BREAKER switch will trip the EXTERNAL POWER switch or the
engine-driven generator’s GEN BREAKERS, if either were supplying the bus.
(15) ESSENTIAL POWER SELECTOR. . . . . . . . . . . . . . . . . . . . .APU; CHECK ESSENTIAL POWER LIGHT OUT
The # 3 BUS TIE BREAKER must be CLOSED.
(16) VOLTAGE, FREQUENCY, AND AMPS. . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . CHECK UNDER LOAD
Electrical power during pre-flight throughout engine start is normally furnished by the APU. External power may be connected through the external power receptacle as an alternate source of electrical power.
Normal ground or flight operation is with the busses in parallel (BUS TIA BREAKERS CLOSED, lights out) and operating as a synchronous bus.
727 fuel panel:
PLEASE re-read the manuals.
You are mixing the fuel system with hydraulic pumps in system A & B???? :-?
Lou
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