FLAP CONTROL LEVER POSITION –UNITS-  NO. 4 FLAP JACKSCRWE POSITION –INCHES-
REQUIRED X2 – X1  ACTUAL X2 EXTEND  ACTUAL X2 – X1 EXTEND  ACTUAL X2 RETRACT  ACTUAL X2 – X1 RETRACT 
1  3.90 to 5.00 
2  13.45 to 14.80 
5  17.84 to 19.34 
10  22.49 to 23.15 
15  24.11 to 24.81 
25  25.26 to 25.94 
30  27.12 to 27.78 
40  29.82 to 30.48 

TABLE I
Nov 15/79 27-51-01 Page 519
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.

(e)  
Position flap control lever in 30-unit detent to retract trailing edge flaps.

(f)  
Measure X2 dimension at number 4 jackscrew. Record value in Table I (RETRACT column).

NOTE:  If flap drive system creeps, wait 5 minutes before measuring X2 dimension.

(g)  
Repeat step (f) with flap control lever in 25, 15, 10, 5, 2, and 1-unit detents per Table

I.

(h)  
Using X1 dimension, perform necessary subtraction to obtain X2 -X1 dimensions in Table I. These dimensions must be within required tolerances.

(5)  Check normal trailing edge flap operating time.
NOTE:  Hydraulic service cart set at 20 gpm and 3000 psig or operation of at least one engine-driven pump is required to perform this portion of test.

G12270
Flap Asymmetry Test Equipment  566 
27-51-01  Figure 506  Feb 15/80 
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(a)  
Move flap control lever from FLAP UP detent to FLAP DOWN (40-unit) detent.

(b)  
Check that time for flaps to extend is 35 +5 seconds.

NOTE:  Operating time should be measured from start of flap motion in up position until downstop on number 4 ball screw nut is 1.50 + 0.20 inches from downstop on the jackscrew.

(c)  
Position flap control lever in FLAP UP detent.

(d)  
Check that time for flaps to retract is 35 +5 seconds.

(6)  Test trailing edge flap alternate drive operation.
(a)  
On circuit breaker panel (P6-2):
1) Open TE ALT FLAP DRIVE MOTOR circuit breaker.
2) Check that FLAP VALVES circuit breaker is closed.

(b)  
Provide hydraulic system A power (Ref 27-51-0 MP).

(c)  
Position alternate flaps arm switch at ARM.

NOTE:  Actuation of alternate flaps arm switch to ARM energizes standby hydraulic pump motor.

(d)  
Operate flap control lever and check that trailing edge flaps do not respond.

(e)  
Close TE ALT FLAP DRIVE MOTOR circuit breaker.

(f)  
Move flap control lever to FLAP DOWN (40-unit) detent.

NOTE:  Flap control lever is moved to FLAP DOWN position as a standard procedure to minimize load on flap hydraulic motor when hydraulic system A is pressurized.

(g)  
Actuate alternate flaps control switch to DOWN position. Hold switch in this position until trailing edge flap motion stops.

WARNING:  LEADING EDGE CONTROL SURFACES WILL EXTEND. ENSURE THAT PERSONNEL AND EQUIPMENT ARE CLEAR.
CAUTION:  DO NOT OPERATE ALTERNATE FLAPS DRIVE MOTOR FOR MORE THAN 4 MINUTES IN A 25-MINUTE TIME SPAN. DRIVE MOTOR MAY OVERHEAT.
NOTE:  Extension of trailing edge flaps is controlled by limit switches.
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Apr 01/97  27-51-01 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  Page 521 

(h)  
Check that time for flaps to extend is 146 +10/-20 seconds.

(i)  
At number 4 jackscrew, measure dimension X2. Check that X2 - X1 is 29.65 to 30.18 inches. Use X1 dimension recorded in step (3)(e).

(j)  
Actuate alternate flaps control switch to UP position. Hold switch in this position until trailing edge flap motor stops.

CAUTION:  DO NOT OPERATE ALTERNATE FLAPS DRIVE MOTOR FOR MORE THAN 4 MINUTES IN A 25-MINUTE TIME SPAN. DRIVE MOTOR MAY OVERHEAT.
NOTE: Retraction of trailing edge flaps is controlled by limit switches.
(k)  
Check that time for flaps to retract is 146 +10/-20 seconds.

(l)  
At number 4 and 5 jackscrews, check that angular clearance between upstop on ball screw nut and upstop on jackscrew yoke is between 1-3/4 to 2-1/4 turns. (This corresponds to a Dimension X of 0.87 to 1.03 inch.)
　
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