(j)  
Check that angle of separation between flap position indicator needles is between 5 to 17 degrees (chordal dimension of 0.05 to 0.18 inch Fig. 506).

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27-51-01 Page 516  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  Oct 20/89 

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5B8 Flap Position Transmitter Installation Feb 20/89 Figure 505A 27-51-01 Page 516A/516B BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.

(k)  
Rotate flap position transmitter input shaft counterclockwise until flap bypass valve red indicator lever point moves to position 2.

(l)  
Check that angle of separation between flap position indicator needles is between  8 to 20 degrees (chordal dimension of 0.08 to 0.21 inch Fig. 506).

(m)  
Rotate flap position transmitter input shaft clockwise until flap bypass valve red indicator lever point moves to position 1.

(n)  
Check that angle of separation between flap position indicator needles is between  5 to 17 degrees (chordal dimension of 0.05 to 0.18 inch Fig. 506).

(o)  
Rotate flap position transmitter input shaft clockwise until left flap position indicator needle lines up with right position indicator needle.

NOTE:  Rotating transmitter shaft clockwise should move position indicator needle toward up position. If needle moves toward 40-unit position, rotate shaft clockwise until needle moves to line up with right position indicator needle.
Tap indicator to remove friction error before installing transmitter.
(p)  Install left flap position transmitter (Fig. 505A). 1) Grease transmitter splines lightly and install transmitter into gearbox keeping
indicator needles aligned. 2) Install mounting screws and washers with wet primer and tighten screws. 3) Check electrical bond between transmitter and gearbox per 20-22-01. Maximum
resistance should not exceed 0.0025 ohm. 4) Lockwire transmitter mounting bolts. (1a) Test right asymmetry shutoff system.
(a)  Repeat steps (1)(a) thru (1)(p) except substitute right where left is noted.
(2)  Test flap asymmetry checking circuit.
(a)  
Place flap control lever in FLAP UP (0-unit) detent.

(b)  
Provide system A hydraulic power to retract flaps (Ref 27-51-0 MP). Hold for 2 minutes.

(c)  
Position flap asymmetry test switch in electronics bay, E-3 electronics equipment rack, to test L position (Fig. 506). 1) Check that test light (Fig. 506) illuminates. 2) Check that left pointer on flap position indicator has moved 22 +5 degrees

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Oct 20/89  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  27-51-01 Page 517 

between left and right pointer tips (Fig. 506).
3)  Check that flap bypass valve has moved to position 2.
4)  Release test switch and check that light has extinguished, indicator needles are
together, and flap bypass valve has returned to position 1.
(e)  Position test switch to Test R position. 1) Check that test light illuminates. 2) Check that right pointer on flap position indicator has moved 22 +5 degrees
between left and right pointer tips (Fig. 506). 3) Check that flap bypass valve has moved to position 2. 4) Release test switch and check that light has extinguished, indicator needles are
together, and flap bypass valve has returned to position 1.
(3)  
Test trailing edge flap indexing.

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

(b)  
Place flap control lever in FLAP UP detent to retract flaps hydraulically.

(c)  
After waiting 2 minutes, remove hydraulic system A power (Ref 27-51-0, MP).

(d)  
At each flap jackscrew, check that angular clearance between stop on ball screw nut and upstop on jackscrew yoke is 170 to 190 degrees (1/2 turn + 10) degrees) turn.

(e)  
At No. 4 jackscrew, measure dimension X (Fig. 505). Record value and label as dimension X1.

(4)  
Test trailing edge flap positioning.

(a)  
Provide hydraulic system A power. Refer to 27-51-0.

(b)  
Position flap control lever in FLAP UP detent to retract flaps and then in the 1-unit detent to extend trailing edge flaps.

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

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

(d)
Repeat step (c) with flap control lever in 2, 5, 10, 15, 25, 30, and 40-unit detents.

NOTE:  To allow for flap drive system creep, wait 2 minutes before measuring X dimension.
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