2.........…..........…............…..............…................1
(b)
On the P5 panel, pull the engine X fire switch out to the emergency fire position.
(c)
Turn and hold the engine X fire handle fully in the direction called out in the table.
S 735-282
(6)
Make sure the BOTTLE DISCH light on the test box comes on.
S 975-283
(7)
Make a record of the voltage from the multimeter (V1).
S 865-038
(8)
Set the toggle switch on the squib test box to the ON position.
S 975-039
(9)
Make a record of the voltage from the multimeter (V2).
S 865-040
(10)
Release the handle and make sure the handle moves to the center 10 degrees.
S 735-041
(11)
Make sure the voltmeter shows 0 +/- 2 volts.
S 865-042
(12)
Put the handle back to the vertical position.
S 865-175
(13)
Push the handle into its usual position.
S 865-043
(14)
Set the toggle switch on the squib test box to the OFF position.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
S 485-044
(15)
Disconnect the squib connector from the squib test box. S 765-178
(16)
Use one of the two alternative procedures to examine the connector.
(a) Calculate the squib discharge circuit resistance Rc, using both pairs of voltages and this formula: Rc = RL (V1/V2) - RL
1) Make sure Rc is less than 3 ohms. NOTE: If Rc is greater than 3 ohms, the circuit may not
____ provide sufficient current to fire the squib.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
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ALL ú ú 02 Page 510 ú Feb 15/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
S 765-179
(17) For the values of V1 in the range listed, make sure the voltage, V2,
is equal to or greater than the value shown in the table: ~..................................................................
| V1 | V2 |
...................................... |
| MIN | MAX | |
.................................................................... | 18.00 | 19.00 | greater than 9.67 | .................................................................... | 19.01 | 20.00 | greater than 10.18 | .................................................................... | 20.01 | 21.00 | greater than 10.69 | .................................................................... | 21.01 | 22.00 | greater than 11.20 | .................................................................... | 22.01 | 23.00 | greater than 11.71 | .................................................................... | 23.01 | 24.00 | greater than 12.22 | .................................................................... | 24.01 | 25.00 | greater than 12.73 | .................................................................... | 25.01 | 26.00 | greater than 13.23 | .................................................................... | 26.01 | 27.00 | greater than 13.74 | .................................................................... | 27.01 | 28.00 | greater than 14.25 | .................................................................... | 28.01 | 29.00 | greater than 14.76 | .................................................................... | 29.01 | 30.00 | greater than 15.27 | .................................................................... | 30.01 | 31.00 | greater than 15.78 | .................................................................... | 31.01 | 32.00 | greater than 16.29 | .................................................................... | 32.01 | 33.00 | greater than 16.80 | .................................................................... | 33.01 | 34.00 | greater than 17.31 | .................................................................... | 34.01 | 35.00 | greater than 17.82 | .................................................................... | 35.01 | 36.00 | greater than 18.32 | 2................…...................….............................1 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：747-400 AMM 飞机维护手册 防火 FIRE PROTECTION 2(55)
