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____ access door will drop approximately one inch (2.5 cm) from the fuselage frame when the last latch is opened.
 NOTE: A lanyard is attached to the aft end of the right access
____ door to hold the access door to the APU compartment bulkhead.
 CAUTION: BE CAREFUL NOT TO MOVE THE TWO APU ACCESS DOORS TO THE
_______ OUTBOARD SIDE FROM THE FULL OPEN POSITION. THE FULL OPEN POSITION IS WHERE THE APU ACCESS DOOR IS DOWN AND THE TWO HOLD-OPEN RODS ARE CONNECTED TO THE TWO BRACKETS ON THE APU COMPARTMENT BULKHEAD. DAMAGE TO THE ELEVATOR CONTROL SURFACES CAN OCCUR.
 (b)  
Open the left access door to the fully open position and remove the two hold-open rods from the two clips.

 (c)  
Remove the two quick-release pins from the two brackets on the left APU compartment bulkhead.

 (d)  
Connect the two hold-open rods from the left access door to the two brackets and install the two quick-release pins.

 (e)  
Push the right access door up and remove the lanyard from the pin on the aft APU compartment bulkhead.

 (f)  
Open the right access door to the fully open position and remove the two hold-open rods from the two clips.

 (g)  
Remove the two quick-release pins from the two brackets on the right APU compartment bulkhead.

 (h)  
Connect the two hold-open rods from the right access door to the two brackets and install the two quick-release pins.

 S 024-020
 (4)  
Do these steps to remove the speed sensor N2 (7):

 (a)  
Disconnect the electrical connector D95015 (P15) (10) from the speed sensor N2 (7).

 (b)  
Remove the two nuts (11) that attach the speed sensor N2 (7) to the accessory gearbox.

 (c)  
Remove the speed sensor N2 (7) and spacer (8).

 NOTE: Make sure you keep the spacer (8) for the installation
____ of the new or serviceable speed sensor N2 (7). The spacer (8) keeps the correct clearance between the speed sensor N2 and oil pump drive spur gear.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
 49-61-02
 ALL  ú ú 03 Page 408 ú Oct 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 (d)  
Remove the packing (9) from the speed sensor N2 (7). 1) Discard the packing (9).

 (e)  
Make sure you install all necessary protection covers.

 TASK 49-61-02-404-027
 5. Speed Sensor N2 Installation (Fig. 401)
____________________________
 A. Equipment
 (1)  
Scraper - Phenolic, Hard Resin (commercially available)

 B.
Consumable Materials

 (1)  
A00590 Compound, Silicone - MIL-S-8660

 (2)  
B00130 Alcohol, Isopropyl - TT-I-735

 (3)  
G00034 Cloth, Process Cleaning Absorbent Wiper (Cheesecloth, Gauze)

 -BMS15-5
 (4)
Lead Seal, Two-Hole (0.375 Inch Outer Diameter and 0.172 Inch Thickness) (9.53 mm Outer Diameter and 4.37 mm Thickness)

 (5)  
Lockwire, Corrosion Resistant Steel (0.025 Inch Diameter) - QQ-W-390

 (6)  
D00418 Oil - Aircraft Turbine Engine

 C.
Parts ~.............................................................................. | AMM | | AIPC | ................. ............................ | FIG | ITEM | NOMENCLATURE | SUBJECT | FIG | ITEM | ................................................................................ | 401 | 7 | Accessory Gearbox Speed Sensor | 49-61-02 | 01 | 15 | | | | (Speed Sensor N2) | | | | | | 9 | Packing | | | 10 | 2.......….......…...................................…...........…......….......1

 D.
Access

 (1)  
Location Zones
 221 Control Cabin - Left
 222 Control Cabin - Right
 310 Fuselage - Station 2360 to Station 2792

 (2)  
Access Panels
 317AL APU Access Door - Left
 318AR APU Access Door - Right

 E.
Procedure

 S 424-047
 CAUTION: REMOVE THE PROTECTION COVERS FROM THE OPENINGS AS NECESSARY.
_______ IF YOU DO NOT REMOVE THE PROTECTION COVERS, DAMAGE TO THE APU CAN OCCUR.
 (1)  
Do these steps to install the speed sensor N2 (7):

 (a)  
Lubricate the new packing (9) with a light coat of engine oil.
　
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