Duc hélices Flash-r User manual

Aérodrome de Villefranche-Tarare (LFHV)

289 Avenue Odette & Edouard DURAND

69620 FRONTENAS - FRANCE

Phone: + 33 (0)4 74 72 12 69

E-mail: contact@duc-helices.com

ISO 9001:2015

TC EASA: EASA P.038

Part 21G EASA: FR.21G.0273

DH_FSH-R_BE_04_A Made in France 06/05/2019

Instruction manual

3-blade propeller

Certified FLASH-R

This instruction manual is to be maintained throughout the life of the propeller.

He may have to evolve. The owner must check with the DUC Hélices company

the latest version being valid applicable to the propeller.

Revision update

Date

Index

Object of modification

09/05/2019

Creation

Every amendment in this document made for the latest revision will appear in dark red.

Identification form

Date

Delivery note n°

Owner

Engine/Gearbox

ratio

Aircraft

1st recommended

pitch blade angle

Notes: ..............................................................................................................................................................................

..........................................................................................................................................................................................

ISO 9001: 2015

TCDS EASA: EASA P.038

Part 21G EASA: FR.21G.0273

Certified FLASH-R

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Summary

1. Presentation of the Certified FLASH-R propeller.......................................................................................................4

Description ........................................................................................................................................................41.1.

Characteristics..................................................................................................................................................41.2.

Shielding leading edge in Inconel®....................................................................................................................51.3.

Accessories.......................................................................................................................................................51.4.

Sales references ...............................................................................................................................................51.5.

2. Applications................................................................................................................................................................6

3. Installation precautions..............................................................................................................................................6

4. Components of the Certified FLASH-R......................................................................................................................7

Mounting configuration of the FLASH-R propeller............................................................................................74.1.

Exploded view for propeller...............................................................................................................................74.2.

List of components............................................................................................................................................84.3.

List of required tools........................................................................................................................................104.4.

5. Assembly instruction of the propeller.......................................................................................................................10

Assembly of the propeller................................................................................................................................105.1.

Installation on the aircraft................................................................................................................................125.2.

Setting of the propeller & Finalization of the installation.................................................................................155.3.

6. Precautions..............................................................................................................................................................18

7. Continuing airworthiness .........................................................................................................................................19

Airworthiness limitations..................................................................................................................................197.1.

Schedule of propeller check............................................................................................................................197.2.

Regular maintenance (by the user).................................................................................................................207.3.

Maintenance of 100 hours or yearly maintenance..........................................................................................217.4.

Impact location on the blade carbon surface ..................................................................................................227.5.

8. General terms of sale...............................................................................................................................................23

Ordering procedure.........................................................................................................................................238.1.

Delivery ...........................................................................................................................................................238.2.

Price ................................................................................................................................................................238.3.

Right of withdrawal..........................................................................................................................................238.4.

Warranties.......................................................................................................................................................23

8.5.

Privacy Policy..................................................................................................................................................238.6.

Litigation..........................................................................................................................................................238.7.

9. Annexes...................................................................................................................................................................24

Dimension of the engine propeller-shaft .........................................................................................................249.1.

912H spacer –Table screw length vs. Spacer thickness .......................................Erreur ! Signet non défini.9.2.

Airfoil ...............................................................................................................................................................259.3.

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1. Presentation of the Certified FLASH-R propeller

Description1.1.

The certified FLASH-R propeller has a new innovative design,

specific about its twisting axis and center of pressure.

Its aerodynamic design allows a "Constant Speed" effect, limiting

variations in engine speed between on ground and in flight.

This propeller allows high efficiency throughout the flight envelope i.e.:

Improved takeoff and climb rate due to higher engine speed, then higher engine efficiency

Many cruise extension

A high user comforts

The blades and the hub of the FLASH-R propeller are manufactured according the DUC Hélices company

technologies, from unidirectional layers of carbon fibers prepreg epoxy resin.

The blade composite structure is defined to obtain the maximum strength in torsion and bending. Therefore

"constant speed" effect is not related to deformation of the blade but its geometry and specific profile.

Due to its specific geometric definition, excellent performance is obtained in both aerodynamic and acoustic,

but also in consumption.

Characteristics1.2.

The Certified FLASH-R propeller range is available:

Ground adjustable propeller

Tractor configuration available in right rotation

Diameters Ø1520 to Ø1900mm (Ø59.8 to Ø74.7")

Shielded leading edge in Inconel®

Carbon composite hub with metallic inserts

Protected again lightning strike

Direct assembly on the propeller-shaft Ø101.6mm

Safety marking on the tip of the propeller

ISO 9001: 2015

TCDS EASA: EASA P.038

Part 21G EASA: FR.21G.0273

Certified FLASH-R

5/27

Shielding leading edge in Inconel®1.3.

The leading edge of the Certified FLASH-R blades is equipped with a metallic shielding in Inconel®. This material is a

superalloy containing mainly nickel, with a very high hardness of surface.

Accessories1.4.

Aluminum mounting spacer (Direct mounting on P.C.D Ø101.6mm/Ø4”)

Moves the plane of the propeller to adjust the position according the engine hood

Aluminum adaptor spacer (Other mounting as SAE1, SAE2, …)

Move the propeller plane and adaptor the P.C.D fixation of the propeller

Spinner available in diameter Ø250mm (Ø9.8") to Ø340mm (Ø14.4”)

Adjusting tool for the setting of the pitch angle of the blades

Neoprene cover protection of the blade

Cleaning treatment for composite propellers

Save money! A clean propeller is more efficient and decreases the fuel consumption.

Sales references1.5.

Designation

Reference

Part number

Three-blade Inconel FLASH-R Right (ROTAX mounting)

01-40-001

H-FSH_3-D-R_I_RX_C

Three-blade Inconel FLASH-R Right (AN6 mounting)

01-40-011

H-FSH_3-D-R_I_AN6_C

Three-blade Inconel FLASH-R Right (AN8 mounting)

01-40-021

H-FSH_3-D-R_I_AN8_C

Note:

Specify the flight regulation aircraft (E.g.: Ultra-light, LSA…) and diameter when ordering (E.g.: ref. 01-21-001/1730).

Inconel shielding

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2. Applications

DUC propellers are given for a flight potential under normal operating conditions. To maintain this potential, DUC

Propellers has determined a TBO (time between revisions) for a propeller based on the engine it equips. See the

section 7.1 Airworthiness Limitations for Information Benefit.

Engine

Gearbox

Propellers limits

Propeller diameter

(mm)

Blade angle

(°)

Blade angle

allowed

range (°)

TBO- Time Between

Overhaul*

(hour)

ROTAX 912S

ROTAX 912iS

ROTAX 914

2.43

160 HP

2 700 RPM

Ø1730

24°± 2°

22° → 30°

2 000 hours

6 years

Ø1750

24°± 2°

22° → 30°

Ø1800

19°± 2°

17°→25°

Ø1850

19°± 2°

17°→25°

Ø1900

18°± 2°

16°→24°

CONTINENTAL O-200

Ø1660

20°± 2°

18°→ 26°

LYCOMING O-235

Ø1660

20°± 2°

18°→ 26°

LYCOMING O-320

Ø1900

20°± 2°

18° → 26°

* It is the maximum period of propeller use allowed by propeller type certificate.

Compliance with CS-P, Subpart D has not been demonstrated as part of the propeller certification.

Remark

The values of the pitch angle are defined by flight test on each engine. If necessary, this setting should be adjusted

according to the aircraft.

For proper use of the propeller, refer to section 7.Continuing airworthiness

3. Installation precautions

WARNING

Make sure the ignition is turned off before starting any type of operation on the propeller.

Do not run the engine without propeller, engine damage will result

IMPORTANT

The blades of a propeller are part of a whole. DO NOT INTERCHANGE with other similar blades from propeller. The

propeller blades are manufactured to their application. Their structure, weight and balance are different from a propeller

to another.

The spinner is an important element for cooling the engine. The aircraft must not fly without a spinner.

Fitting a different spinner will be an addendum to this manual approved by the DUC to confirm its compatibility with the mounting of

the propeller.

The propeller is delivered with the appropriate screws. The change of the screws is contrary to our recommendations unless

validated by the manufacturers.

WARRANTY CONDITIONS

The user is still flying under its full responsibility (see.8.General terms of sale).

ISO 9001: 2015

TCDS EASA: EASA P.038

Part 21G EASA: FR.21G.0273

Certified FLASH-R

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4. Components of the Certified FLASH-R

Mounting configuration of the FLASH-R propeller4.1.

Here is a configuration table of the three-blade certified FLASH-R propeller mounting according the propeller-shaft of

the engine.

If needed, see annex 9.1 Dimension of the engine propeller-shaft

MOUNTING

ENGINE PROPELLER-SHAFT

Ø4" / Ø101.6mm

(Rotax)

Type SAE1

Ø4-3/8" / Ø111.125mm

(Ex: Continental O-200)

Type SAE2

Ø4-3/4" / Ø120.65mm

(Ex: Lycoming O-320)

direct on propeller-

shaft (without spacer)

with spacer

with adaptor spacer

Exploded view for propeller4.2.

Remark

This exploded view shows the principle of the certified FLASH-R propeller assembly. The size of all of these

components changes depending on the configuration of the propeller (diameter hole of the metallic inserts of the half-

hub, length of the screws…).

Inconel FLASH-R

blade right(x3)

Screws & washers

for hub assembly (x6)

Hub camping washer (x1)

Locking nuts & washers

for hub assembly (x6)

Rear half-hub (x1)

with rear metallic inserts (x6)

According to mounting

Fixing screws and washers of the propeller

adapted according the mounting (x6)

Internal hub spacer (x1)

Caution when handling the blades

CUTTING TRAILING EDGE

Front half-hub (x1)

with front metallic inserts (x6)

According to mounting

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List of components4.3.

Designation

Optional

(According to

the recommend

mounting)

Part Number

Quan

tity

Spacer (optional)

912H spacer - 3mm

EI-912H-3

912H spacer - 6mm

EI-912H-6

912H spacer - 10mm

EI-912H-10

912H spacer –15mm

EI-912H-15

912H spacer - 20mm

EI-912H-20

912H spacer - 45mm

EI-912H-30

912H spacer - 30mm

EI-912H-45

912H spacer - 60mm

EI-912H-50

912H spacer - 30mm

EI-912H-60

912H spacer - 70mm

EI-912H-70

912H spacer - 75mm

EI-912H-75

912H spacer - 80mm

EI-912H-80

912H spacer - 100mm

EI-912H-100

912H spacer - 120mm

EI-912H-120

Dowel spacer DUC Ø13 L20

PI-DUC13-20

Dowel spacer DUC Ø13 L30

PI-DUC13-30

Dowel spacer DUC Ø13 L40

PI-DUC13-40

Dowel spacer DUC/ROTAX Ø13 M8 L28

PI-RX-28

Dowel spacer DUC/ROTAX Ø13 M8 L30

PI-RX-30

Screws CHC M8x40mm

(included pins contact lock washer Ø8mm and Nylstop self-locking nut M8)

V-CHC8-40

Adaptor spacer (optional)

SAE1-AN6 adaptor spacer - 30mm

E-SAE1AN6-30

SAE1-AN6 adaptor spacer - 70mm

E-SAE1AN6-70

SAE1-AN6 adaptor spacer - 80mm

E-SAE1AN6-80

SAE1-AN6 adaptor spacer - 100mm

E-SAE1AN6-100

SAE2-AN6 adaptor spacer - 30mm

E-SAE2AN6-30

SAE2-AN7 adaptor spacer - 90mm

E-SAE2AN7-90

SAE2-AN7 adaptor spacer - 100mm

E-SAE2AN7-100

SAE2-AN8 adaptor spacer - 30mm

E-SAE2AN8-30

Dowel spacer DUC Ø17 AN6

PI-DUC17-AN6

Dowel spacer DUC Ø17 AN8

PI-DUC17-AN8

Safety washer DUC AN6

RS-AN6

Safety washer DUC AN8

RS-AN8

Screws 3/8" UNF 1-3/4"

V-3/8-1_3/4

Screws 1/2" UNF 1-1/2"

V-1/2-1_1/2

Screw 3/8" UNF 2-1/2"

V-3/8-2_1/2

Screw 3/8" UNF 3"

V-3/8-3

Hub

3-blade rear half-hub Certified FLASH-R ROTAX

DMFSH-3-AR_RX_C

3-blade rear half-hub Certified FLASH-R AN6

DMFSH-3-AR_AN6_C

3-blade rear half-hub Certified FLASH-R AN8

DMFSH-3-AR_AN8_C

Certified internal FLASH-R hub spacer

EMFSH_C

3-blade front half-hub Certified FLASH ROTAX

DMFSH-3-AV_RX_C

3-blade front half-hub Certified FLASH AN6

DMFSH-3-AV_AN6_C

3-blade front half-hub Certified FLASH AN8

DMFSH-3-AV_AN8_C

Screws CHC M8x30

(Included narrow plain washer Ø8mm and Nylstop self-locking nut M8)

V-CHC8-30

Certified hub clamping washer FLASH ROTAX

RS-FSH-RX_C

Certified hub clamping washer FLASH AN6

RS-FSH-AN6_C

Certified hub clamping washer FLASH AN8

RS-FSH-AN8_C

ISO 9001: 2015

TCDS EASA: EASA P.038

Part 21G EASA: FR.21G.0273

Certified FLASH-R

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Designation

Optional

(According to

the recommend

mounting)

Part Number

Quan

tity

Blade FLASH-R

Certified Inconel FLASH-R blade, Right

FSH-D-R_I_C

Fixing screws

Screws CHC M8x130

(included pins contact lock washer Ø8mm and Nylstop self-locking nut M8)

V-CHC8-130

Screws CHC M8x140

(included pins contact lock washer Ø8mm and Nylstop self-locking nut M8)

V-CHC8-140

Screws CHC M8x150

(included pins contact lock washer Ø8mm and Nylstop self-locking nut M8)

V-CHC8-150

Screws CHC M8x160

(included pins contact lock washer Ø8mm and Nylstop self-locking nut M8)

V-CHC8-160

Screws CHC M8x180

(included pins contact lock washer Ø8mm and Nylstop self-locking nut M8)

V-CHC8-180

Screws CHC M8x200

(included pins contact lock washer Ø8mm and Nylstop self-locking nut M8)

V-CHC8-200

Screws DUC AN6-52

(included washer 960-616)

V-AN6-52

Screws DUC AN8-52

(included washer 960-816)

V-AN8-52

Accessories: Spinner & Mounting plate

3-blade spinner mounting plate Ø250mm ROTAX

P-250_3-RX

3-blade spinner mounting plate Ø250mm Ø17

P-250_3-17

3-blade spinner mounting plate Ø260mm ROTAX

P-260_3-RX

3-blade spinner mounting plate Ø260mm Ø17

P-260_3-17

3-blade spinner mounting plate Ø270mm ROTAX

P-270_3-RX

3-blade spinner mounting plate Ø270mm Ø17

P-270_3-17

3-blade spinner mounting plate Ø290mm ROTAX

P-290_3-RX

3-blade spinner mounting plate Ø290mm Ø17

P-290_3-17

3-blade spinner mounting plate Ø300mm ROTAX

P-300_3-RX

3-blade spinner mounting plate Ø300mm Ø17

P-300_3-17

3-blade spinner mounting plate Ø340mm ROTAX

P-340_3-RX

3-blade spinner mounting plate Ø340mm SAE1-AN6

P-340_3-SAE1AN6

3-blade spinner mounting plate Ø340mm SAE2-AN6

P-340_3-SAE2AN6

3-blade spinner mounting plate Ø340mm SAE2-AN7

P-340_3-SAE2AN7

3-blade spinner mounting plate Ø340mm SAE2-AN8

P-340_3-SAE2AN8

3-blade spinner Ø250mm

C-250_3

3-blade spinner Ø250mm L

C-250L_3

3-blade spinner Ø260mm

C-260_3

3-blade spinner Ø270mm

C-270_3

3-blade spinner Ø290mm

C-290_3

3-blade spinner Ø300mm

C-300_3

3-blade spinner Ø340mm

C-340_3

Spinner closure plate

CC-250_350

Spinner screws M5x16mm

V-P5-16

Spinner screws AN-525-10R8

AN-525-10R8

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List of required tools4.4.

Rotax mounting

SAE1/SAE2 mounting (Lycoming, Continental, …)

6 Torque Allen Wrench (Torque: 25 Nm)

Flat key 13

Inclinometer (angle adjustment tools)

Nylon mallet

Torque screwdriver (Torque: 4 Nm)

6 Torque Allen Wrench (Torque: 25 Nm)

Flat key 13

3/8 or 1/2 Torque Wrench (Torque: 30 to 45 Nm)

Inclinometer (angle adjustment tools)

Nylon mallet

Torque screwdriver (Torque: 4 Nm)

5. Assembly instruction of the propeller

The assembly of the Three-blade Certified FLASH-R propellers is shown below. It is recommended to assemble the

propeller on a worktable before installing it on the plane.

For further information, contact the DUC Hélices Company.

Assembly of the propeller5.1.

A « Propeller Form » will be done to insure a propeller follow-up. Parts Number and component serial number of

propeller will be written on this form.

STEP

Place the rear half-hub on a worktable.

Be careful not to invert with the front hub half.

Depending on your installation, the rear half-hub is one

mounted on the propeller-shaft of the engine or on a

spacer. The diameter of the bore of the metal inserts of

the rear half- hub is larger than the bore of the metal

inserts of the front half-hub.

STEP

Place the hub spacer in the center of the rear half-hub.

STEP

Positioning the blades in their hub slots by placing them

outwards.

The three blades of the propeller have been

balanced at DUC Helices before their dispatch.

Position the DUC Hélices logo facing you.

Note that the metal inserts of the half-hub allow a

locking of the blades in their axis within the hub.

ISO 9001: 2015

TCDS EASA: EASA P.038

Part 21G EASA: FR.21G.0273

Certified FLASH-R

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STEP

Place the front half-hub (metal insert with small hole)

on the set to fit with the blade foots and internal spacer.

STEP

From the front hub, set up the 6 screws and washers

for hub assembly. At the rear, place washers and lock

nuts.

Perform initial moderate tightening.

STEP

Place the hub clamping washer on the front of the

propeller hub (logo side).

Be sure the direction of the clamping washer

(rounded edge outwards).

Place the 6 fixing screws and their washer.

In the case of pin contact washers, the pins are

oriented towards the screw head.

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Installation on the aircraft5.2.

As presented in section 4.1. Mounting configuration of the FLASH-R propeller, several mountings are possible:

1. Installing directly on propeller-shaft of the engine

2. Use a spacer for spacing propeller from the propeller-shaft

3. Use an adaptor spacer to adjust the diameter fixing of the propeller and for spacing the propeller from the

propeller-shaft

5.2.1. Direct installation on the aircraft

The direct installation of the FLASH-R propeller is possible only with the following conditions:

Engine propeller-shaft type Rotax (6 indexing dowels Ø13 on P.C.D. Ø101.6mm/Ø4")

Engine propeller-shaft out of the engine hood of 14mm for the mounting of the DUC spinner

If needed, see in annex 9.1 Dimension of the engine propeller-shaft.

Remark: All engines having a propeller-shaft with a P.C.D. Ø101.6mm/Ø4" can install the FLASH propeller directly.

The holes of the metal inserts of the rear half-hub must be adapted to suit with the indexing dowels of the

propeller-shaft. For further information, contact the DUC Propellers.

14 mm

min.

5 mm min.

ISO 9001: 2015

TCDS EASA: EASA P.038

Part 21G EASA: FR.21G.0273

Certified FLASH-R

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5.2.2. Use of a spacer

A spacer is necessary in the following case:

Engine propeller-shaft type Rotax (6 indexing dowels Ø13 on P.C.D. Ø101.6mm/Ø4")

Engine propeller-shaft positioned inside the engine hood or positioned at less than 14mm

Determination of the spacer length:

Measure the distance X between the propeller-shaft and the engine hood limit, then add 14mm.

Available spacer:

Engine

Model

P/N

Length (XX)

ROTAX

Spacer 912H

E-912H-XX

3, 6, 10, 15, 20, 30, 45, 50, 60, 70,

75, 80, 100, 120mm

→ The length of the hardware necessary to fix the propeller is defined by the DUC Hélices design office. This is also

the case when it is necessary to set up an intermediate spacer.

→ Tightening screws: see step 7 of § 5.3. Propeller adjustment & Finalizing the assembly.

→ The spacers are delivered with the dowels.

Propeller-shaft not

outside the engine

hood

14 mm min.

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5.2.3. Use of adaptor spacer

An adaptor spacer is necessary in the following case:

Engine propeller-shaft different than the type Rotax (other than P.C.D. Ø101.6mm/Ø4")

If needed, see in annex 9.1 Dimension of the engine propeller-shaft

Determination of the adaptor spacer length:

Measure the distance X between the propeller-shaft and the limit of the engine hood, then add 14mm.

Available adpator spacer:

Engine

Type

Model

Length (XX)

Continental O-200

Lycoming O-233 / 235

Adaptor spacer SAE1 AN6

E-SAE1AN6-XX

30mm

70mm

80mm

100mm

Lycoming O-320 (3/8 dowels)

Adaptor spacer SAE2 AN6

E-SAE2AN6-XX

30 mm

Lycoming O-320 (7/16" dowels)

Adaptor spacer SAE2 AN7

E-SAE2AN7-XX

90 mm

100 mm

Lycoming O-360

Adaptor spacer SAE2 AN8

E-SAE2AN8-XX

30mm

Placing of brake plates under the heads of the fixing bolts of the spacer to prevent the unscrewing of these. (steps

folding 1 → 2 → 3)

→ The length of the hardware necessary to fix the propeller is defined by the DUC Hélices design office. This is also

the case when it is necessary to set up an intermediate spacer.

→ Tightening screws: see step 7 of § 5.3. Propeller adjustment & Finalizing the assembly.

→ The spacers are delivered with the dowels.

Propeller-shaft not

outside the engine

hood

14 mm min.

ISO 9001: 2015

TCDS EASA: EASA P.038

Part 21G EASA: FR.21G.0273

Certified FLASH-R

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Setting of the propeller & Finalization of the installation5.3.

At this point, the propeller is installed on your aircraft with the spinner mounting

plate.

If the propeller is already assembled and the blades angle set, pass directly

STEP 7.

Otherwise, follow all the steps below to adjust the pitch angle before the final

tightening of the screws.

A reminder of the definition of the airfoil and its vocabulary is presented in annex

Erreur ! Source du renvoi introuvable..

STEP 1.

Side view

Front view

For the setting, the concerned blade must be place in horizontal position.

The setting is done with the adjusting tool flatten against the intrados (leading edge up) at 25 cm from the blade tip.

The angle of attack is formed by the vertical and the intrados of the blade.

To do this, place your aircraft horizontally, so that the propeller mounting flange is perfectly vertical.

Check with the level of the adjustment tool (measured value = 90°). If unable to change the longitudinal axis of the

aircraft, raising the value of the Xangle propeller shaft plate to subtract the value of the blade angle to be

resolved.

90°

Propeller-

shaft plate

0°

90°

(90° - X)

25 cm

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STEP 2.

Slightly untighten the propeller fixing screws

and the hub assembly screw.

STEP 3.

Horizontal blade, leading edge upward, place the adjustment tool at 25 cm from the tip of the blade, intrados

side (flat), handle down.

STEP 4.

Set the desired value of the adjustment tool.

Caution to apply the value Xif a correction of the aircraft plan was needed.

STEP 5.

Correct the position of the bubble on the adjustment tool by rotating the blade in the hub. To do this, using a mallet,

lightly tap on the foot of the blade in the desired direction.

Do not apply pressure near the trailing edge, thinner area.

Adjustment roller of the

angle of attack

Reading blade angle

Intrados of the blade with the

leading edge upwards

Horizontal blade

25 cm

ISO 9001: 2015

TCDS EASA: EASA P.038

Part 21G EASA: FR.21G.0273

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TIGHTENING TORQUE

2,5 Kg/m 25 N.m

STEP 6.

Once the desired pitch angle obtained, slightly tighten the assembly screws of

the hub, those around the foot blade and then perform the same operation on

each of the other blades.

STEP 7.

Remove the adjusting tool from the propeller then perform a first tightening of the bolts manually.

Then, carry out a progressive tightening of all the screws by applying the correct torque with a torque wrench:

Mounting with a 912H spacer:

Assembly of the three-blade hub + Fixation of the

spacer (EI-912H-80, 100, 120):

(screw length adapted according the adaptor spacer

length and the starter flange on the propeller-shaft)

Propeller fixing: (or spacer if spacer > 80mm)

Screw CHC M8 & pin contact washer (screw length

adapted according the length of the spacer).

Use with dowel threaded on the engine propeller shaft

(Ex: For Rotax 912S, Screws CHC M8x130mm)

Mounting with an Adaptor spacer:

Assembly of the three-blade hub

Fixation of the Adaptor spacer:

Screws AN6 or AN8

(screw length adapted according the

adaptor spacer length and the starter

flange on the propeller-shaft)

Propeller fixing screws:

SAE1: Screws DUC AN6-52

SAE2: Screws DUC AN8-52

Remark: It is imperative to use a spinner when using propeller FLASH-R.

The mounting plate of the spinner can be placed before or after the spacer

adaptation. It is necessary to adapt the mounting in function of its position

TIGHTENING TORQUE

2,5 Kg/m 25 N.m

TIGHTENING TORQUE

2,5 Kg/m 25 N.m

TIGHTENING TORQUE

ADAPTOR SPACER

AN6 bolt (3/8"): 3.0 Kg/m 30 N.m

AN7 bolt (7/16"): 3.5 Kg/m 35 N.m

AN8 bolt (1/2"): 4,5 Kg/m 45 N.m

TIGHTENING TORQUE

PROPELLER FIXING

AN6 bolt (3/8"): 3 Kg/m 30 N.m

AN7 bolt (7/16"): 3.5 Kg/m 35 N.m

AN8 bolt (1/2"): 4,5 Kg/m 45 N.m

Certified FLASH-R

18/27

IMPORTANT

After a 1-hour operation following the installation or modification of the

assembly, recheck the assembly of your propeller according the instructions

manual using appropriate tools (tightening torque, pitch angle…).

STEP 8.

After a final verification (position and orientation of parts, tightening...), mount the spinner on its plate by tightening

the spinner screws to a torque of 4Nm (0.4kg/m) with the appropriate tools.

In the presence of a marking, please respect the indexing of the spinner from its plate.



At this point, the Certified FLASH-R propeller is ready for first tests.

The user must perform the appropriate regulations procedures

to change the propeller in accordance with applicable regulations of the aircraft

6. Precautions

PRECAUTIONS

If you notice any abnormal installation or operation, do not undertake the flight and immediately contact the DUC

Hélices company.

Being aware of potential risks during assembly and initial testing of the propeller. Stay focused,

attentive and vigilant to your environment. Recheck several times points to be observed.

Maintaining high safety clearance during the set operation.

The products of the DUC Hélices company must be installed and used according to the instruction manuals provided.

No modification can be made without the agreement of DUC Hélices company. The non-compliance of these data

assumes no responsibility for the DUC Hélices company and makes out the warranty of the considered products

(See section 8. General terms of sale).

ISO 9001: 2015

TCDS EASA: EASA P.038

Part 21G EASA: FR.21G.0273

Certified FLASH-R

19/27

7. Continuing airworthiness

Airworthiness limitations7.1.

Today, the three-blade Certified FLASH-R has a limited flight potential of 2000 hour.

However, a program is organized by DUC Hélices to improve this flight potential.

This paragraph « Airworthiness limitations » is approved by EASA according to the Part 21.A.31 (a) and

CS-P 30(b).

Any changes to this paragraph or documents which are linked to this paragraph should be submitted to EASA for a

new agreement.

For more information contact the DUC Hélices Company

Schedule of propeller check7.2.

Type

Frequency

Screws tightening

After the first working fly

Regular

Each pre-flight

General

Every 100 hours or annually

TBO

Every 2000 hours

See manual DH_TBO_BE_01_A –Instruction Manual TBO

Certified FLASH-R

20/27

Regular maintenance (by the user)7.3.

For a safety use of the FLASH propellers, it is necessary that the user performs regular maintenance to detect any abnormalities.

Frequency of checking: Each pre-flight

Checkpoints

Control methods

Location

Possible problems

Actions

Fixation

of the propeller

Manually maintaining the tip of a blade

of the propeller, shake it firmly to feel

if a too much clearance appears in the

setting of the propeller.

Propeller fixation screws

Clearance in the propeller fixation

Stop propeller use and apply these corrective actions

Check screws.

If necessary, change the propeller fixations screws & Check

all the mounting to avoid problems.

Degradation of

propeller

Check visually the entire propeller

without dismantling (blade root,

Inconel leading edge, surface of the

blade, spinner, hub, etc.)

Blade root

Big scratch/marking on the blade

Stop blade use*. You have to change the blade.

Small scratch/marking on the blade

If small marking without deformation, continue to use it.

Crack

Stop blade use*. You have to change the blade.

Shielding leading edge in

Inconel

Lifting

Stop blade use*. You have to change the blade.

Significant impact: deep scratches, break,

deformation

(see. paragraph 7.5.)

Stop blade use*. You have to change the blade.

Low impact: not deep scratches

(see. paragraph 7.5.)

No mechanic risk, continue to use it.

Blade

Significant impact: deep scratches

Local delamination

(see. paragraph 7.5.)

Stop blade use*. You have to change the blade.

Low impact: not deep scratches, small scratch,

small impact

(see. paragraph 7.5.)

No significant risk

Propeller adhesive loss

No significant risk, continue to use it.

Fixation

of the spinner

Check visually the fixation screws of

the spinner

Spinner fixation screws

Play/Gap in the spinner

Check the screws. If necessary, change it.

Tighten the screws to proper torque with wrench

A marking paint of all the screw/washer/hub after tightening

can be done to help make a visual check outside of the

general maintenance.

* Nota: All the blades are balanced together. When a blade is changed, the blade has to be balanced to keep this balancing. For this, contact the DUC Hélices company.