(e) Loosen the four mount bolts (4) that attach the SCU to the four mount brackets. 1) Re-tighten the four mount bolts (4) to 85-95 pound-inches
(9.6-10.7 newton-meters).
S 432-005-N00
CAUTION: BEFORE YOU CONNECT THE GROUND CABLE TO THE SCU, EXAMINE THE
_______ CABLE MOUNTING LUGS TO MAKE SURE THE LUGS ARE SECURED TO THE CABLE AND THE CABLE WIRES (STRANDS) ARE A MINIMUM OF 75 PERCENT NOT BROKEN. LOOSE LUGS OR TOO MANY BROKEN WIRES (STRANDS) CAN NOT GIVE SUFFICIENT PROTECTION FROM A LIGHTNING STRIKE.
(4)
Attach the ground cable (5) from the SCU to Flange B2:
(a)
Remove the bolt (6), washer (7) and nut (8) that are
temporarily attached to Flange B2.
(b)
Put the ground cable (5) to the bolt hole in Flange B2.
(c)
Attach the ground cable (5) to Flange B2 with the bolt (6), threads lubricated with engine oil, washer (7) and nut (8).
(d)
Tighten the bolt (6) to 85-95 pound-inches (9.6-10.7
newton-meters).
S 432-006-N00
CAUTION: DO NOT USE LUBRICANTS ON THE SENSING HOSE, CAP ASSEMBLY, OR
_______ GASKET UNLESS SPECIFIED DIFFERENTLY. LUBRICANT CAN CAUSE CONTAMINATION OF THE SCU.
(5)
If the SCU has the multiplexing option, install the connector nut on the top of the flex hose (3) to the adapter at the bottom side of the SCU.
(a)
Tighten the connector nut to 270-300 pound-inches (30.5-33.9 newton-meters).
(b)
Install the lockwire or safety cable and safety cable ferrule.
S 432-007-N00
CAUTION: EXAMINE THE HARNESS CONNECTORS AND THE MATING RECEPTACLES FOR
_______ BENT PINS AND CONTAMINATION. CAREFULLY MAKE STRAIGHT ANY BENT PINS AND CLEAN AS NECESSARY.
(6)
Connect the connectors for wiring harness (W2P34) (10) and wiring harness (W2P33) (9) to the SCU harness receptacles:
(a)
Remove the protection covers.
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747-400 MAINTENANCE MANUAL
(b)
Examine the harness connector and the mating receptacle for bent pins and contamination. 1) If necessary, carefully make straight any bent pins. 2) If necessary, clean the connector and receptacle with
Denatured Ethyl Alcohol.
a) Let the alcohol become dry.
(c)
Align the connector keyways and engage the connector to the mating receptacle.
(d)
Tighten the connector coupling nut with your hand until you cover the witness (color) band and the connector coupling nut is handtight.
NOTE: The witness (color) band is the first band on the
____ receptacle that you cover when you tighten the connector coupling nut.
CAUTION:_______USE THE CORRECT ASSEMBLY TOOLS. USE OF THE WRONG ASSEMBLY TOOLS CAN RESULT IN CONNECTOR DAMAGE OR A LOOSE CONNECTOR. A LOOSE CONNECTOR PERMITS VIBRATION AND CAN RESULT IN CONTACT WEAR AND POOR LIGHTNING PROTECTION.
(e) Use the TG-70 strap wrench or the TG-69 soft-jawed pliers and tighten the connector coupling nut. 1) Use sufficient force to make sure these conditions occur:
NOTE: This procedure will make sure the contacts are
____ sufficiently engaged and the connector is tight.
If you use too much force, the strap wrench and pliers will turn around on the connector coupling nut. This will prevent too much torque.
See the instructions given with the strap wrench for correct use.
a) The connector coupling nut is fully tight b) The connector fits tightly against the receptacle (metal to metal).
S 432-008-N00
(7)
Attach the W2 cable to the mount bracket:
(a)
Remove the bolt (11) from the tab of the upper rear mount bracket.
(b)
Put the attached cushioned clamp (12) that is on the W2 cable to the tab of the mount bracket.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
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ALL ú ú N01 Page 207 ú Feb 15/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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