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.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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 ALL  ú ú 02 Page 509 ú Oct 10/96
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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
　
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