# FALCON 7X

No 289 JANUARY 21, 2015 

# MANDATORY
ATA 24 ELECTRICAL POWER

RAM AIR TURBINE SMOOTH RAT DEPLOYMENT AND WARNING PLATE

REPLACEMENT 

# FALCON SERVICE BULLETIN

Copyright © 2015 by Dassault Aviation All rights reserved. No part of this work may be reproduced or copied in any form or by any means without written permission

of Dassault Aviation.



### 785

### ELECTRICAL POWER RAM AIR TURBINE SMOOTH RAT DEPLOYMENT AND WARNING PLATE REPLACEMENT

Initial issuance January 21, 2015 List of effective pages : 1 to 13 

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ATA 24

### ELECTRICAL POWER RAM AIR TURBINE SMOOTH RAT DEPLOYMENT AND WARNING PLATE REPLACEMENT

1. PLANNING INFORMATION A. EFFECTIVITY This Service Bulletin is applicable to FALCON 7X aircraft with serial numbers 2 and subsequent that have not previously implemented DASSAULT AVIATION modification FALCON 7X M1428. B. REASON A few cases of Ram Air Turbine (RAT) blade damaged during maintenance operations have been reported. Damage occurred either during stowage of the RAT or its deployment for maintenance purposes and are caused by an incorrect locking of the RAT during retraction. The purpose of this Service Bulletin is to improve stowing instructions in order to prevent such situations. C. DESCRIPTION The operation consists in replacing the sticker on the RAT with a new one with improved stowing instructions. D. COMPLIANCE Mandatory:

• It is anticipated that this Service Bulletin will be rendered mandatory by an EASA Airworthiness Directive. • As prescribed by the Airworthiness Authorities of the country of registration of the aircraft. E. APPROVAL This Service Bulletin covers DASSAULT AVIATION modification FALCON 7X M1428 that has been approved under the authority of DOA nr. EASA.21J.051. The technical content of this document is approved under the authority of DOA nr. EASA.21J.051. F. LABOR Estimated labor-hours: Refer to Service Bulletin Commercial Summary. CAUTION: TWO OPERATORS ARE NECESSARY TO DEPLOY AND RETRACT THE RAT. NOTE: These labor-hours only concern the work described in this Service Bulletin and do not include other maintenance work that may be performed on this occasion. G. MATERIAL - PRICE AND AVAILABILITY The modification kit may be obtained from either address listed below: 

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January 21, 2015 ATA 24 Initial issuance Page 1 / 13DASSAULT AVIATION Proprietary DataWestern hemisphere: DASSAULT FALCON JET CORP. SPARES DISTRIBUTION CENTER 200 RISER ROAD LITTLE FERRY, NJ 07643 U.S.A. Telephone: • CANADA and U.S.A.: 1-800-800-4036 • MEXICO: 001-800-800-4036 • Other countries: 1-201-541-4809 Fax: • CANADA and U.S.A.: 1-800-800-4817 • MEXICO: 001-800-800-4817 • Other countries: 1-201-440-7021 Other continents: DASSAULT AVIATION Falcon Spares BOITE POSTALE N°101 AEROPORT DU BOURGET 93350 - LE BOURGET Cedex (FRANCE) Please contact your Dassault Aviation Account Representative Telephone: 33 (0)1.48.35.56.78 Fax: 33 (0)1.48.35.56.00 E/H dafsorder@dassault-aviation.com Price and availability on request. H. TOOLING - PRICE AND AVAILABILITY Normal maintenance tooling. Helmet for OP_B I. WEIGHT AND BALANCE Change in weight: None. Change in balance with respect to 25% MAC: None. J. REFERENCES Aircraft Maintenance Manual: • GENERAL MAINTENANCE AND SAFETY PRECAUTIONS (Refer to TASK 20-00-00-910-801 )

• ELECTRICAL SYSTEM MAINTENANCE AND SAFETY PRECAUTIONS ( Refer to TASK 24-00-00-910-801 )

• RAT SYSTEM MAINTENANCE AND SAFETY PRECAUTIONS ( Refer to TASK 24-50-00-910-801 ) • RETRACTION OF THE RAM AIR TURBINE (RAT) (Refer to TASK 24-50-00-910-804 )

• HYDRAULIC SYSTEM MAINTENANCE AND SAFETY PRECAUTIONS ( Refer to TASK 29-00-00-910-801 ) 

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January 21, 2015 ATA 24 Initial issuance Page 2 / 13DASSAULT AVIATION Proprietary DataUTC AEROSPACE SYSTEMS - Service Bulletin ERPS39T-24-2

K. OTHER PUBLICATIONS AFFECTED The following publication will be revised at a later date to account for the changes introduced by this Service Bulletin: • Illustrated Parts Catalog. 

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January 21, 2015 ATA 24 Initial issuance Page 3 / 13DASSAULT AVIATION Proprietary Data2. ACCOMPLISHMENT INSTRUCTIONS

A. PRELIMINARY STEPS (1) The aircraft must be in the maintenance configuration (Refer to TASK 20-00-00-910-801 ). (2) Obey the electrical system maintenance and safety precautions ( Refer to TASK 24-00-00-910-801 ). (3) Obey the RAT system maintenance and safety precautions (Refer to TASK 24-50-00-910-801 ). (4) Obey the hydraulic system maintenance and safety precautions ( Refer to TASK 29-00-00-910-801 ). (5) Remove the screws and the protective cover from RAT restow pump ( 3000PN ) ( fig. 1 ). B. PROCEDURE (1) Deploy the RAT as follows: NOTE 1: Two operators are necessary to slowly and safely deploy the RAT. NOTE 2: OP_Aand OP_B will be used in the following procedure to describe who should do

what. CAUTION: MAKE SURE THAT THE AIRCRAFT SYSTEMS ARE DE-ENERGIZED. THIS WILL

PREVENT INJURIES TO PERSONNEL AND DAMAGE TO THE EQUIPMENT. CAUTION: MAKE SURE THAT NO-ONE, EXCEPT OP_B WILL ACCESS NEITHER THE

AIRCRAFT COCKPIT, NOR THE RAT DEPLOYMENT AREA (FRONT RH SIDE OF THE AIRCRAFT) DURING THE FOLLOWING STEPS. WARNING: OP_B RISKS SEVERE INJURIES IN CASE OF UNTIMELY RAT DEPLOYMENT

IF THE PROCEDURE IS NOT PROPERLY APPLIED (HELMET IS MANDATORY). (a) OP_A takes place in the NLG wheel and removes the RAT ground lock pin (AGE 13811) through the RH structure of the NLG wheel well to unlock the RAT uplock mechanism. (b) OP_B takes place in the cockpit. (c) OP_A , using a 7/16 in (0.4375) key, turns the restow pump “ARM/STOW” valve (2-fig. 1) from “ARM” to the “STOW” position. From that point, OP_A must mandatorily keep a constant pressure on this key to stay on the “STOW” position during all following steps. (d) OP_A , with his other hand, operates the restow pump handle (1-fig. 1) as if he wanted to retract the RAT. This will increase the oil pressure in the system, counter-act the deployment actuator spring, and force the RAT deployment actuator to stay in the stowed position.

• OP_Astops pumping on the handle when it is becoming more and more difficult.

• OP_Athen indicates OP_B that he’s ready for RAT deployment.

• OP_Acontinues of course to keep the pressure / key on the “STOW” position. 

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January 21, 2015 ATA 24 Initial issuance Page 4 / 13DASSAULT AVIATION Proprietary Data(e) OP_B in the cockpit pulls the “RAT MANUAL DEPLOYMENT” lever and keeps the lever pulled until OP_Areports the RAT door has slightly open. NOTE: A loud sound (“clong”) is heard when the uplock hook releases the RAT. The RAT is now unlocked but shall not deploy as restow pump key is still set on “STOW" position (by OP_A ). (f) From that point, OP_Awill make the RAT deploy slowly: • Releasing slightly the key from the “STOW” position will slowly deploy the RAT. • Setting back the key to the “STOW” position will slow/stop the RAT deployment.

• If necessary (if RAT blade is jammed) : “stow” position + lever actuation will move up and retract the RAT turbine & blade. (g) As soon as OP_Asees the RAT door slightly opening, OP_A stops the deployment and OP_B releases the "RAT MANUAL DEPLOYMENT" lever. (h) OP_B exits the cockpit, takes a mirror and a ~20 inches long stick. Then he goes and checks the good deployment of RAT. fig. 2 and fig. 3 provide recommended safety location for OP_B

. WARNING: OP_B SHALL NEVER PUT DIRECTLY HIS ARMS / HANDS / HEAD IN THE FIG.

3 “DANGER AREA”. FROM THAT POINT, IF OP_A MISTAKENLY DISCONNECTS THE KEY FROM THE “STOW” POSITION OF THE RESTOW PUMP (BEWARE, THE KEY CAN EASILY SLIDE), THE RAT (AND BLADES) WILL SUDDENLY DEPLOY AND MAY CAUSE INJURIES TO OP_B. (i) During RAT deployment, OP_B shall check that the RAT deploys freely: • the blade should not be behind the uplock hook solenoid ( fig. 4 ),

• if the blade goes behind the uplock hook solenoid (meaning the RAT turbine was not well locked when previously stowed, has rotated and that the RAT may be blocked / damaged by the uplock hook solenoid), then OP_A shall stop deployment and OP_B shall free the blade using the stick (so that his hands may not be hurt by RAT/blade deployment in case of wrong operation by OP_A ). (j) At 50% of RAT deployment, OP_B shall visually check if the RAT index lock pin is well engaged (= pin engaged in the slot at the rear of the turbine hub) ( fig. 5 ) (k) When RAT is fully deployed, OP_A can release the “STOW” position and remove the key. (2) Replace the warning plate according to UTC Aerospace Systems Service Bulletin ERPS39T-24-2 ( fig. 6 ). CAUTION: IDENTIFICATION OF THE NEW PART NUMBER MUST BE PERFORMED USING

A BALLPOINT PEN. (3) Send to technicalcenter@dassault-aviation.com the result of the inspection: • Subject: Service Bulletin 7X-289 feedback • Aircraft serial number, date and location

• Please answer question: was the RAT rotation well blocked (index lock pin engaged) when deployed and checked at 50% ? • Please answer question: was a blade jammed (i.e.: behind the uplock hook solenoid) ? C. FINAL STEPS 

# FALCON 7X 7X -289

January 21, 2015 ATA 24 Initial issuance Page 5 / 13DASSAULT AVIATION Proprietary Data(1) Retract the RAT (Refer to TASK 24-50-00-910-804 ). NOTE 1: Two operators are necessary to retract the RAT. NOTE 2: 10° corresponds to 40 restow pump actions. (2) Install the protective cover on RAT restow pump ( 3000PN ) and attach it with the screws ( fig. 1 ). D. RECORDING Record compliance with this Service Bulletin in the appropriate aircraft documents. Fill out the electronic Service Bulletin reply form located in the ”Service Bulletin" page on the Falcon portal. 

# FALCON 7X 7X -289

January 21, 2015 ATA 24 Initial issuance Page 6 / 13DASSAULT AVIATION Proprietary Data3. MATERIAL INFORMATION

A. MODIFICATION OF RAT PART NUMBER

NEW P/N QTY KEY WORD OLD P/N 1705673B with symbol 24-2 1 RAT 1705673A

NOTE: Compliance with this Service Bulletin by substituting the above part number(s) with (an) interchangeable subsequent part number(s) is acceptable, provided the subsequent part numbers have the same effectivity as the original part number. B. MODIFICATION KIT Kit P/N SBF7X0289A NEW P/N QTY KEY WORD 1721516 1 Warning plate C. LOCAL PROCUREMENT Refer to UTC Aerospace Systems Service Bulletin ERPS39T-24-2. 

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January 21, 2015 ATA 24 Initial issuance Page 7 / 13DASSAULT AVIATION Proprietary DataFigure 1: RESTOW PUMP - "ARM/STOW" VALVE + LEVER 

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January 21, 2015 ATA 24 Initial issuance Page 8 / 13Figure 2: RECOMMENDED LOCATION OF OP_B (TO CHECK SAFELY THE RAT DEPLOYMENT) 

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January 21, 2015 ATA 24 Initial issuance Page 9 / 13Figure 3: RECOMMENDED LOCATION OF OP_B 

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January 21, 2015 ATA 24 Initial issuance Page 10 / 13Figure 4: EXAMPLE OF RAT DEPLOYMENT 

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January 21, 2015 ATA 24 Initial issuance Page 11 / 13Figure 5: EXAMPLE OF RAT ROTATION WELL LOCKED 

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January 21, 2015 ATA 24 Initial issuance Page 12 / 13Figure 6: RAT MODIFIED



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January 21, 2015 ATA 24 Initial issuance Page 13 / 13