S 014-005
 (4)
Open the mid lower strut aft access door on the strut left side.

 S 014-037

 (5)  
On inboard engines, open the mid lower strut aft access door on the strut right side.

 S 014-036

 (6)  
On the outboard engines, open the forward lower midspar pressure relief access door on the strut right side (AMM 06-09-09/201).

 S 034-006

 (7)  
Disconnect the electrical connector (3) from the PRSOV (1):

 (a)  
DV83 - PRSOV ENGINE 1

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A
747-400 MAINTENANCE MANUAL
 (b)  
DV85 - PRSOV ENGINE 2

 (c)  
DV86 - PRSOV ENGINE 3

 (d)  
DV87 - PRSOV ENGINE 4

 S 034-007
 (8)  
Disconnect the bonding jumper (2) from the PRSOV (1).

 S 034-008

 (9)  
Disconnect the two tubes (6 and 7) from the PRSOV (1).

 S 034-009

 (10)
 Remove the couplings (4) from the PRSOV (1).

 S 024-038
 CAUTION: DO NOT HOLD THE TEMPERATURE SENSOR PROBE OF THE PRSOV DURING
_______ THE PRSOV REMOVAL OR INSTALLATION. DAMAGE TO THE PROBE COULD OCCUR.
 (11)
 Remove the PRSOV (1) through the left access door.

 S 034-011

 (12)
 Remove the seals (5) from the duct flanges.

 S 034-012

 (13)
 Put covers on the open ducts to keep out unwanted objects.

 S 034-013

 (14)
 If you must replace the PRSOV (1) with a new PRSOV, remove these parts from the used PRSOV:

 (a)  
Remove the elbows (8 and 11), jam nuts (9 and 12), and O-rings (10 and 13) from the precooler pressure sense port and the downstream pressure sense port.

 (b)  
Discard the O-rings.

 (c)  
Remove the ground stud (20) from the PRSOV.

 TASK 36-11-04-404-035
 3. The PRSOV Installation (Fig. 401)
______________________
 A. Consumable Materials
 (1)  
D01062, Never-Seez, Pure Nickel Special, NSBT-8N
 (High temperature anti-seize compound)

 (2)  
D00062 - Lubricant, Pneumatic System Thread, FS 1292 (Fluor-Silicone) MIL-G-4343

 (3)  
G00095 - Detector, - Leak, Leak-Tek (160X)

 B.
References

 (1)  
AMM 06-09-09/201, Nacelle and Engine-to-Wing Fairing Access Doors and Panels

 (2)  
AMM 20-11-15/401, Bonding Jumpers and Ground Leads

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747-400
MAINTENANCE MANUAL

 (3)  
AMM 20-22-01/601, Electrical Bonding

 (4)  
AMM 24-22-00/201, Manual Control

 (5)  
AMM 36-00-00/201, Pneumatic System

 (6)  
AMM 71-00-00/201, Power Plant

 C. Access
 (1)  
Location Zone
 452 Engine 1 - Strut Torque Box
 462 Engine 2 - Strut Torque Box
 472 Engine 3 - Strut Torque Box
 482 Engine 4 - Strut Torque Box

 (2)  
Access Panel 452FL Access Door, Mid Lower Strut Aft - Engine 1 452ER Access Door, Forward Lower Midspar Pressure Relief -

Engine 1 462FL Access Door, Mid Lower Strut Aft - Engine 2 462ER Access Door, Mid Lower Strut Aft - Engine 2 472FL Access Door, Mid Lower Strut Aft - Engine 3 472ER Access Door, Mid Lower Strut Aft - Engine 3 482FL Access Door, Mid Lower Strut Aft - Engine 4 482ER Access Door, Forward Lower Midspar Pressure Relief -
Engine 4
 D. Procedure
 S 434-015
 (1)  
If it is necessary, install the fittings on the PRSOV (1):

 (a)  
Apply the lubricant to the new O-rings (10 and 13).
　
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