S 496-045
(3)
Raise the jacking apparatus against the pad and apply an upward load of approximately 1600 pounds (7120 newtons) but not more than 2200 pounds (9790 newtons).
S 226-046
(4)
Measure the free play at the left stabilizer hinge:
(a)
Write the free play reading from the dial indicator and refer to it as A, A = _______________ (inches/millimeters).
S 086-047
(5)
Remove the force from the jacking apparatus.
(a)
Make sure that the dial indicator reading returns to zero.
S 496-048
(6)
Install the dial indicator below the right stabilizer hinge fitting to measure the vertical motion of the hinge fitting.
(a)
Set the dial indicator to zero.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
27-41-02
ALL ú ú 03 Page 612 ú Oct 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
S 496-047
CAUTION: USE SUFFICIENT PAD ON THE JACKING APPARATUS TO PREVENT DAMAGE
_______ TO THE STABILIZER SURFACE AND DISTRIBUTE THE APPLIED LOAD TO STABILIZER STRUCTURE.
(7)
Put the cushioned pad against underside of stabilizer at intersection of stabilizer rear spar and rib approximately right stabilizer station 360.0.
S 496-049
(8)
Raise the jacking apparatus against the pad and apply an upward load of approximately 1600 pounds (7120 newtons) but not more than 2200 pounds (9790 newtons).
S 226-050
(9)
Measure the free play at the right stabilizer hinge:
(a)
Write the free play reading from the dial indicator and refer to it as B, B = _______________ (inches/millimeters).
S 086-051
(10)
Remove the force from the jacking apparatus.
(a)
Make sure that the dial indicator reading returns to zero.
S 226-052
(11)
Find the free play of the stabilizer hinge:
(a)
Make Y the free play of the stabilizer hinge.
(b)
The free play Y is the average of the free plays A and B.
(c)
The maximum Y permitted is 0.036 inch (0.91 millimeter).
(d)
If the stabilizer hinge free play exceeds the specified limit, overhaul the horizontal stabilizer pivot pins (OHM 55-10-01), and/or replace the stabilizer hinge bearing and bushings.
J.
Find the Total Flutter Free Play of the Horizontal Stabilizer
S 226-018
(1)
Find the total flutter free play of the horizontal stabilizer:
(a)
The total flutter free play is the sum of U and V:
Where: U = X multiplied by 12.8205 V = Y multiplied by 25.9430
S 226-058
(2)
If the stabilizer flutter free play exceeds the specified limit, then do these steps:
(a)
Do a check of the stabilizer trim drive mechanism wear to identify components that require repair or replacement (AMM 27-41-06/601).
(b)
Repair or replace all components that exceed the specified wear limits.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
27-41-02
ALL ú ú 01 Page 613 ú Oct 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
(c) In case all components are within the specified wear limits but the flutter free play exceeds the specified limit, repair or replace the components that are closest to the specified wear limits. 1) The maximum flutter free play permitted is equal to or less
than 1.0000 inch (25.40 millimeters).
K. Put the Airplane to its Usual Condition
S 496-063
(1)
Install the spray shields on the center section of the horizontal stabilizer.
S 416-060
(2) 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：747-400 AMM 飞机维护手册 飞行操纵 FLIGHT CONTROLS 3(157)
