Content .. 36 37 38 39 ..

WT9 Dynamic LSA. AIRCRAFT MAINTENANCE MANUAL (AS-AMM-01-000, 22. 05. 2017) - page 38

Effectivity:

ALL

04. 07. 2019

WINGS

–

Trim tab

–

Bracket

–

Hinge rod

–

Right aileron

–

Locking wire ø0

.8 mm

Fig. 57-8 Aileron Trim Tab Removal / Installation

GENERAL

PROPELLERS

61-00

GENERAL

1. INTRODUCTION

The aircraft can be equipped with three blades fixed pitch propeller EVRA
PerformanceLine 175/xxx/805.5 or with three blades in-flight adjustable propeller
KW-31 (EASA.P.177).

2. TROUBLESHOOTING

For troubleshooting of propeller KW-31 follow the instructions in the original equipment
manuals.

TROUBLE

POSSIBLE CAUSE

REMEDY

Engine vibration

Propeller out of balance.

Examine the propeller.
If you find damage,
contact aircraft
manufacturer.

The propeller mounting
bolts are loose.

Tighten propeller
mounting bolts to specific
torque in crosswise
pattern.

The spinner attaching
bolts are loose.

Tighten spinner attaching
bolts to specific torque.

Blade tracking not correct.

Contact aircraft
manufacturer.

Incorrect propeller
alignment.

Remove the propeller.
Install the propeller
in the correct position.
Refer to Chapter 61-10.

PROPELLER ASSEMBLY

PROPELLERS

61-10

PROPELLER ASSEMBLY

1. DESCRIPTION

A. EVRA PerformanceLine 175/xxx/805.5

is 3-blade on ground adjustable

propeller with diameter 1.750 m (68.90 in). Its blades have wooden core covered
with  glass  fabric,  stiffened  with  metal  leading  edges.  Blades  are  fixed
in  aluminium  hub  that  consists  of  two  parts.  The  lower  hub  (in  contact
with the engine or gearbox flange) is different from the upper hub. Propeller's hub
is through a flange attached to engine's propeller shaft. The composite spinner
is fixed to the spinner flange.
The halves of hub (lower hub on the engine flange side, upper hub from the front
side) are marked on their side faces by numbers. It is necessary to synchronize
them face to face during the final assembly. There must be a small gap between
the halves of hub that ensures the blades are properly fixed when the hub bolts
are tightened.
The lower hub has smaller notches than upper hub for M6 nuts.
The blades are numbered on the metal part of leading edge with numbers 1 or 2
or 3. These blades are balanced with the hub so it is very important to respect
their  position  within  the  hub  (the  blade  No.  1  in  the  hub  slot  No.  1,  the  blade
No. 2 in the hub slot No. 2...).
On  the  leading  edge  of  the  blades  there  are  three  marks  (three  lines),  that
represent the "07 R" 70% of the radius. It is the place where you have to make

the pitch angle readings of the blades when adjusting the blades. The “07 R” is

represented by the middle line mark.

B. KW-31 (EASA.A.177)

is a 3-blade electrically operated in flight adjustable aircraft

propeller  with  diameter  1.726  m  (67.95  in)  diameter.  The  blades  are  made
of  combination  of  lash  wood  and  composite.  The  propeller  can  be  operated
in  either  manual  or  with  automatic  mode  as  a  constant  speed  propeller.
The leading edges are protected by stainless steel stamping.

NOTE

For more details refer to

“UM

-05 EN - User Manual Aircraft Propeller

Type-Model KW-

31”,

last valid issue.

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ALL

28. 04. 2021

PROPELLERS

2. MAINTENANCE PRACTICES

A. Propeller EVRA PerformanceLine 175/xxx/805.5

Type of maintenance:

Line

Personnel qualification:

Independent certifying staff qualified in accordance

with Part-66 or higher.

Recommended tools, materials, persons and documentation:

ITEM

QUANTITY

Wrench 13

1 pc

Screwdriver

1 pc

Hex key 4

1 pc

Hex key 5

1 pc

Hex key 6

1 pc

Loctite 243

Persons

Tab. 61-1 Recommended tools, materials, persons and documentation

WARNING

ENGINE IGNITION MUST BE SWITCHED OFF! DISCONNECT
NEGATIVE TERMINAL OF AIRCRAFT BATTERY.

(1) Propeller removal:

(a) Make sure that the

IGNITION

switches are set to

OFF

(b)  Remove the engine cowlings (Chapter 71-10).
(c)  Disconnect negative terminal of battery (Chapter 24-30).
(d)  Remove upper line of spark plugs from the engine.
(e)  Unscrew bolts (7, Fig. 61-1) with washers (8) and remove the propeller

spinner (6).

(f)

Unscrew and remove nuts (3) and washers (4); hold the propeller (1).

(g) Pull the propeller forward; remove the bolts (2) with washers (4),

balance weight (5), propeller (1) and flanges (9; 10) from the engine
flange.

(h) Put the protective covers on the propeller blades and store

the propeller on a safe place so that no damage can occur.

(i)

As necessary, disassemble flanges (9; 10), by unscrewing the bolts
(11) and removing washers (12).

(j)

If necessary, unscrew the shear pins (14)

PROPELLER ASSEMBLY

PROPELLERS

(2) Propeller installation:

CAUTION

WHEN

THE

NEW

PROPELLER

INSTALLED,

IT IS NECESSARY TO CHECK THE TORQUE MOMENTS
OF BOLTS AFTER FIRST HOUR OF FLIGHT OPERATION!

(a) Make sure that the

IGNITION

switches are set to

OFF

(b) Make sure that the battery is disconnected and upper line of spark

plugs is removed from the engine.

(9, 10) and the propeller (1). Clear of all impurities.

(d) Remove protective covers from the propeller blades and carry out

visual check of the propeller integrity and condition.

(e) If flanges (9, 10) are disassembled, use washers (12) and bolts (11)

secure using Loctite 243. If shear pins (14) are disassembled,
or in the case of a new part, install shear pins (14) and secure using
Loctite 243. Make sure that marks on flange (10) and spinner flange
(9) are aligned. If necessary, make new marks (in the case of new
parts).

CAUTION

PAY ATTENTION TO ALIGNMENT MARKS (ARROWS).

(f)

Attach the assemble flanges (9; 10), propeller (1), and balance weight
(5) on engine flange (13) by means of the bolts (2), washers (4)
and nuts (3).

(g) After the propeller is correctly positioned on the engine, manually turn

the  propeller  in  opposite  direction  of  engine  rotation  to  eliminate
the  play  of  the  bolts  (2)  in  propeler  hub.  Ensure  that  the  marks
on flange (10) and propeller (1) are aligned. If necessary, make new
marks  (in  the  case  of  new  parts).  Tighten  bolts  (2)  in  order
as described in Fig. 61-2 to torque moment 25 Nm. The rated torque
of bolts should be applied gradually, in three successive operations.
The  torque  of  each  operation  will  be  increased  starting  from  1/3
of the nominal value.

(h) Retighten bolts (3, Fig. 61-4) to torque moment 12 Nm.
(i)

Measure the difference in distance of individual blade tips
from marking (see Fig. 61-3). The ends of the blades have to be within
range 6 mm. If tolerance is exceeded, do not start the engine operation
and investigate the cause.

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PROPELLERS

(j)

Put the propeller spinner (6, Fig. 61-1) on the spinner flange (9), align
the marks on spinner (6) and spinner flange (9). If necessary, make
new marks (in the case of new parts). Attach it with bolts (7)
and washers (8).

CAUTION

PAY ATTENTION TO ALIGNMENT MARKS (ARROWS).

(k) Install spark plugs in the engine. Tighten them with torque 20 Nm

on cold engine.

(l)

Connect negative terminal of battery (Chapter 24-30).

(m) Install the upper and lower engine cowling (Chapter 71-10).

–

Propeller

–

Polyamide washer ø4

.3 (9 pcs)

–

Bolt M8 x 146 (6 pcs)

–

Spinner flange

–

Self-locking nut M8 (6 pcs)

–

Flange

–

Washer ø8

.4 x 16 x 1.6 (8 pcs)

–

Bolt M5 x 25 (6 pcs)

–

Balance weight

–

Washer ø5

.3 x 10 x 1 (6 pcs)

–

Spinner

–

Engine shaft

–

Bolt M4 x 16 (9 pcs)

–

Shear pin

Fig. 61-1 EVRA PerformanceLine 175/xxx/805.5 Removal / Installation

PROPELLER ASSEMBLY

PROPELLERS

Fig. 61-2 Bolt tightening sequence

Fig. 61-3 Checking of axial propeller running-out

Effectivity:

ALL

28. 04. 2021

PROPELLERS

(3) Propeller disassembling:

(a) Unscrew nuts (4, Fig. 61-4), remove bolts (3) and washers (5).
(b) Remove front propeller hub (1; 2) and blades (6).

–

Front propeller hub

–

Self-locking nut M6 (6 pcs)

–

Rear propeller hub

–

Washer ø6

.4 x 12 x 1.6 (6 pcs)

–

Socket head bolt M6 x 30 (6 pcs)

–

Blade

Fig. 61-4 EVRA PerformanceLine 175/xxx/805.5 Disassembling / Assembling

PROPELLER ASSEMBLY

PROPELLERS

(4) Propeller assembling:

(a) Check contact area of propeller hubs (1; 2, Fig. 61-4), and propeller

blades (6). Clear all impurities.

(b) Put blades (6) into the rear propeller hub (2), fit front propeller hub (1).
(c) Insert bolts (3), put washers (5) and screw nuts (4).

WARNING

BEWARE TO ENSURE CORRECT ORIENTATION
AND POSITION OF BLADES AND PROPELLER HUB.
FOLLOW THE MARKS ON BLADES AND PROPELLER
HUB!

(d) Adjust the blades (see 2.A.(5)).
(e) Tighten bolts in the order described in Fig. 61-2. Tighten bolts

(3, Fig. 61-4) to torque moment 12 Nm.
The rated torque of bolts should be applied gradually, in three
successive operations. The torque of each operation will be increased
starting from 1/3 of the nominal value.
There must be a gap between the halves of propeller hub. Check all
around the constant gap between the halves of propeller hub (1; 2).

WARNING

IF CONTACT OCCURS BETWEEN THE HALVES
OF PROPELLER HUB, DO NOT START THE ENGINE.
CONTACT

THE

AIRCRAFT

MANUFACTURER

FOR ADDITIONAL INSTRUCTIONS.

Effectivity:

ALL

28. 04. 2021

PROPELLERS

(5) Propeller pitch adjustment:

Adjust blades pitch and balance the propeller always when replacing
the blades, or after hearing noise or feeling vibration during flight.
Type of maintenance:

Line

Personnel qualification:

Independent

certifying

staff

qualified

in accordance with Part-66 or higher.

Recommended tools, materials, persons and documentation:

ITEM

QUANTITY

Wrench 13

1 pc

Screwdriver

1 pc

Hex key 5

1 pc

Hex key 6

1 pc

Propeller balancer

1 pc

Protractor

1 pc

Weights

1 pc

Persons

Tab. 61-2 Recommended tools, materials, persons and documentation

(a) Put the propeller on a spindle propeller balancer.
(b) Release bolts (2, Fig. 61-1; 3, Fig. 61-4) so that it is possible to adjust

angle of attack of blades.

Put protractor on reference point marked by three lines on blade

’

leading edge approximately 270 mm from tip of the blade.

(d) Set blade to vertical position. Set referen

ce angle on protractor to 23°

and turn the blade around its axis to 23°. Tighten bolts (3,

Fig. 61-4)

around currently adjusted blade (see 2.A.(4)(e)).

(e) Repeat the same procedure (d) for other blades.
(f)

Tighten the bolts (2, Fig. 61-1) (see 2.A.(2)(g)).

PROPELLER ASSEMBLY

PROPELLERS

Fig. 61-5

Adjusting Blade´s Pitch

(6) Propeller balancing:

(a) Put complete propeller (flanges, propeller, weight and spinner)

on a balancer.

(b) If the propeller is out of balance, the heaviest blade will turn downward.
(c) To balance the propeller, use balancing weights and stick to inside

of rear flange (9, Fig. 61-1) on the opposite side of the heavy blade.

(d)

Repeat this procedure (steps “b” and “c”) until all blades remain

still regardless of propeller position.

(7) Propeller inspection:

(a)  If dirty, clean blades with soapy water (Chapter 12-20).
(b)  Check for cracks.
(c)  Check metal leading edges for delamination and damage.
(d)  Check tightening of bolts every 100 flight hours or six months.

Effectivity:

ALL

28. 04. 2021

PROPELLERS

B. Propeller KW-31

Type of maintenance:

Line

Personnel qualification:

Independent certifying staff qualified in accordance

with Part-66 or higher.

Recommended tools, materials, persons and documentation:

ITEM

QUANTITY

Wrench 13

1 pc

Screwdriver

1 pc

Hex key 6

1 pc

Loctite 243

Persons

Tab. 61-3 Recommended tools, materials, persons and documentation

WARNING

ENGINE IGNITION MUST BE SWITCHED OFF! DISCONNECT
NEGATIVE TERMINAL OF AIRCRAFT BATTERY.

(1) Propeller removal:

(a) Make sure that the

IGNITION

switches are set to

OFF

(b)  Remove the upper engine cowling (Chapter 71-10).
(c)  Disconnect negative terminal of battery (Chapter 24-30).
(d)  Remove upper line of spark plugs from the engine.
(e)  Unscrew  and  remove  nuts  (3,  Fig.  61-6)  and  bushings  (4);  hold

the propeller (1).

(f)

Pull the propeller forward; remove the propeller (1) from the engine
flange (5).

(g) Put the protective covers on the propeller blades and store

the propeller on a safe place so that no damage can occur.

(h) If necessary, disassemble the carbon brush housing (6),

(Chapter 61-10, 2.B.(3)).

(2) Propeller installation:

(a) Make sure that the

IGNITION

switches are set to

OFF

(b) Make sure that the battery is disconnected and upper line of spark

plugs is removed from the engine.

and the engine flange (5). Clear of all impurities.

(d) Remove protective covers from the propeller blades and carry out

visual check of the propeller integrity and condition.

(e) Attach the propeller (1), on engine flange (8) by means of bushings

(4), and nuts (3).

PROPELLER ASSEMBLY

PROPELLERS

(f)

After the propeller is correctly positioned on the engine, tighten nuts
(3) in order as described in Fig. 61-7. Tighten nuts (3, Fig. 61-6)
to torque moment 22 Nm. The rated torque of nuts should be applied
gradually, in three successive operations. The torque of each
operation will be increased starting from 1/3 of the nominal value.

(g) Install the carbon brush housing (see 2.B.(4)).
(h) Install spark plugs in the engine. Tighten them in accordance

with instructions of the engine manual.

(i)

Connect negative terminal of battery (Chapter 24-30).

(j)

Install the upper engine cowling (Chapter 71-10).

(3) Carbon brushes housing removal:

(a) Make sure that

MASTER SWITCH

and

IGNITION

switches are set

OFF

(b)  Remove the upper engine cowling (Chapter 71-10).
(c)  Disconnect negative terminal of battery (Chapter 24-30).
(d)  Unscrew the bolts (9, Fig. 61-6), washers (8) and wires (10).
(e)  Unscrew the bolts (7).
(f)

Remove the carbon brush housing (6).

(4) Carbon brush housing installation:

(a) Make sure that

MASTER SWITCH

and

IGNITION

switches are set

OFF

(b) Connect the wires (10, Fig. 61-6) to the carbon brush housing (6)

according to Aircraft Wiring Manual (Doc. No. AS-AWM-01-000).
Put washers (8) and tighten by using bolts (9).

bolts (7).

(d) While turning the propeller by hand it should be checked that

the carbon brushes seat properly in the centres of the brass slipways
(2), and contact with their entire surfaces.

(e) Tighten the bolts (7) and secure using Loctite 243.
(f)

Connect negative terminal of battery (Chapter 24-30).

(g) Install the upper engine cowling (Chapter 71-10).

Effectivity:

ALL

28. 04. 2021

PROPELLERS

–

Propeller

–

Carbon brush housing

–

Brass slipways

–

Bolt M8 x 16 (2 pcs)

–

Self-locking nut M8 (6 pcs)

–

Spring lock washer M4 (2 pcs)

–

Bushing (6 pcs)

–

Bolt M4 x 6 (2 pcs)

–

Engine flange

–

Wires

Fig. 61-6 Propeller KW-31 Removal / Installation

PROPELLER ASSEMBLY

PROPELLERS

Fig. 61-7 Bolts tightening sequence

Content .. 36 37 38 39 ..