NOTE:  Engine thrust lever movement from idle to maximum thrust position should take at least 60 seconds.

(c)  
Engine vibration indicator pointers should move a minimum of half a pointer width during operation.

(d)  
Record maximum engine vibration reading and corresponding engine N2 percent rpm in log book.

NOTE:  This test is not intended for establishing any vibration limits of engine, but to find out if system is functioning properly. However, obtained data can be used as guide in establishing reference point on indicator for normal engine vibration, usually done during first few flights after engine change.

(e)  
Move engine thrust lever to idle position.

(f)  
Place ENG VIBRATION PICKUP selector switch to TURBINE position.

(g)  
Repeat steps (b) through (e).

(3)  
Restore Airplane to Normal Configuration

(a)  
Shut down engines in accordance with Chapter 71, Power Plant.

(b) 
 Remove electrical power.

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ENGINE VIBRATION PICKUP - REMOVAL/INSTALLATION
1.  Remove Inlet Section Vibration Pickup
A.  Obtain access to inlet vibration pickup by opening applicable cowl panel (Ref Chapter 71, Engine Cowling).
B.  Disconnect electrical plug from vibration pickup. See Fig. 401, Detail A, for inlet section vibration pickup. See Fig. 401, Detail B, for turbine section vibration pickup.
C.  Cut and remove lockwire.
D.  Remove mounting screws and lift vibration pickup free of bracket.
2.  Install Vibration Pickup
A.  Place vibration pickup on bracket, align holes, install mounting screws, and lockwire (Fig. 401).
B.  Connect electrical plug to vibration pickup.
C.  Close applicable cowl panels.
D.  Test Vibration System Operation (Engines Running) with pickup selector switch in first INLET then TURBINE position (Ref 77-32-0).
502 
Nov 15/67  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  77-32-11 Page 401 

Engine Vibration Pickup Installation  502 
77-32-11  Figure 401  Nov 15/67 
Page 402 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.