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connection and operation.
Obey the instructions of your airworthiness
authority for control checks.
(20) Do a low-range static leak test. Refer to Chapter 34-10
(21) Do a pitot leak test. Refer to Chapter 34-10
(22) Install these items:
− Pilot’s seats.
− Access panels below the fuselage for the
control connections.
− Access panels below the wing roots for
the B-bolts.
Refer to Chapter 25.
Refer to Chapter 52-40
Refer to Chapter 52-40
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3. Bolt Play
A. Radial Play
The wing connection bolt values given in the table below must not be exceeded.
A-bolt in spherical bearing 0.08 mm 0.003"
B-bolt in spherical bearing 0.08 mm 0.003"
Main bolt in spar stump bushing 0.125 mm 0.005"
Main bolt in spar bridge bushing 0.08 mm 0.003"
To measure radial play, measure the diameter of the appropriate bolt and bearing/bushing. The
difference between diameters must not exceed the values given in the above table.
B. Axial Play
Maximum admissible values:
Spherical bearing for B-bolt 0.89 mm 0.035"
To measure axial play, the wing tip is to move forward, then back, the change in the gap
between the fuselage and wing root rib (directly above the B-Bolt), must not exceed the values
stated in the above table.
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CHAPTER 57-50
FLAPS
1. General
This Chapter tells you about the flap structure. See Chapter 27-50 for data about the flap control
system.
The flap hinge axis is below the wing. The flaps move back as they go down.
2. Description
Figure 1 shows the flap structure. Each flap has these components:
A. Top Shell
The top shell has inner and outer GFRP skins. The skins bond to a rigid plastic foam core.
Carbon cloth gives extra strength and stiffness in the outer skin.
B. Bottom Shell
The bottom shell has inner and outer GFRP skins. The skins bond to a rigid plastic foam core.
Carbon cloth gives extra strength and stiffness in the outer skin.
C. End Ribs
The end ribs are rigid carbon moldings. They bond to the top and bottom shells.
D. Flap Horn
The flap horn is aluminum alloy. Bolts and nuts attach the flap horn to the flap.
E. Flap Hinges
Each flap has 3 hinges (and the flap horn). The flap hinges are stainless steel. Bolts attach the
flap hinges to the flap.
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Figure 1: Flap Structure
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MAINTENANCE PRACTICES
1. General
These maintenance practices tell you how to remove and install the flaps. Refer to Chapter 27-50
for data on adjusting the flap controls.
2. Remove/Install A Flap
A. Remove A Flap
Detail Steps/Work Items Key Items
CAUTION: MAKE SURE THAT THE AREA UNDER THE FLAPS IS CLEAR
BEFORE YOU MOVE THE FLAPS.
(1) Lower the flaps:
− Set the BAT/GEN switch to ON.
− Set the flap selector to LDG.
− When the flaps stop moving:
− Set the BAT/GEN switch OFF.
(2) Remove the bolt which attaches the control
rod to the flap horn.
Hold the flap.
(3) Remove the pivot bolts from the hinges and
the flap horn.
Hold the flap.
(4) Remove the flap from the airplane.
B. Install A Flap
Detail Steps/Work Items Key Items
(1) Put the flap in position on the airplane. Hold the flap.
(2) Install the pivot bolts in the hinges and the
flap horn.
Hold the flap.
Make sure that there is a gap of 3mm
(0.12 in) between the flap and the aileron.
(3) Install the bolt which attaches the control rod
to the flap horn.
(4) Do a test for correct adjustment of the flaps. Refer to Chapter 27-50
(5) Do an inspection of the flap controls which
you disconnected or adjusted.
(6) If necessary for your airworthiness authority,
do a second inspection of the flap controls.
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Figure 2: Flap Connections
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CHAPTER 57-60
AILERONS
1. General
This Chapter tells you about the aileron structure. Refer to Chapter 27-10 for data about the aileron
control system.
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