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 ALL OPERATORS TELEX - ALL OPERATORS TELEX

 SUBJECT: ATA 27 - ELEVATOR SERVOCONTROLS - DAMPING

 POSITION INSPECTION AND REPLACEMENT OF THE SOLENOID VALVES

 O-RING SEALS

 OUR REF: AOT A330-27A3129 REV 01 - DATED 16 JULY 2004

 OUR PREVIOUS REF.: AOT A330-27A3129 DATED 24 JUNE 2004

 0. REASON FOR REVISION

 THE AIM OF THIS REVISION IS TO INFORM OPERATORS THAT THE

 INFORMATION IN IPC 27-34-51 FIG 1 IS NOT CORRECT REGARDING

 THE PART NUMBER OF THE SEALS ITEM 130, 140 AND 150 TO BE

 INSTALLED ON ELEVATOR SERVOCONTROLS PN SC4800-2/-4/-7/-8.

 IPC 24-34-51 FIG 1 CORRECT PART NUMBERS FOR ITEMS 130, 140

 AND 150 ARE:

 - ITEM 130: NAS1611-011

 - ITEM 140: NAS1611-012

 - ITEM 150: NAS1611-013

 SEALS WITH PN MS28775-XXX ARE NOT QUALIFIED FOR HYDRAULIC

 SYSTEMS APPLICATIONS. THEIR INSTALLATION CAN LEAD TO THEIR

 COMPLETE DEGRADATION IN A SHORT-TIME AND THEREFORE, MUST

 NOT BE USED TO REPLACE THE SEALS IN SOLENOID VALVES.

 FAILURE OF THE SEAL MAY LEAD TO HYDRAULIC SYSTEM LOSS. 2

 SYSTEMS ARE POTENTIALLY AFFECTED.

 AS A CONSEQUENCE, AIRBUS REQUESTS TO REMOVE THOSE SEALS

 IMMEDIATELY.

 THIS AOT WILL BE FOLLOWED BY A TELEGRAPHIC CN (CONSIGNE DE

 NAVIGABILITE).

 NOTE 1: SEAL REFERENCES FOR SERVOCONTROLS PN SC4800-7A/-9/-

 10/-11 INDICATED IN IPC 27-34-51 FIG 1A ARE CORRECT.

 NOTE 2: AN IPC TEMPORARY REVISION WILL BE ISSUED WITHIN 3

 WEEKS.

 THE REVISED PARAGRAPHS ARE INDICATED BY THE: **REV**

 MARKING.

 1. AIRCRAFT AFFECTED

 ALL A330-200 IN-SERVICE AIRCRAFT.
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 2. REFERENCED DOCUMENTS

 **REV** REF.1: IPC 27-34-51-1/-1A ITEMS 80, 120, 130,

 140, 150 / SOLENOID VALVE AND O-RING SEALS

 CAUTION : IPC 24-34-51 FIG 1 CORRECT PART NUMBERS

 FOR ITEMS 130, 140 AND 150 ARE:

 ITEM 130: NAS1611-011

 ITEM 140: NAS1611-012

 ITEM 150: NAS1611-013

 - REF.2: OIT REF. 999.0066/04/BB REV 01 DATED 11 JUN 2004/

 ELEVATOR SERVOCONTROL - ELEVATOR BLOCKED IN FULL PITCH DOWN

 POSITION DUE TO A DUAL FAILURE

 - REF.3: AMM 27-34-51-000-804 / REMOVAL OF THE ELEVATOR

 SERVOCONTROL UNIT SOLENOID VALVES

 - REF.4: AMM 27-34-51-400-804 / INSTALLATION OF THE

 ELEVATOR SERVOCONTROL UNIT SOLENOID VALVES

 - REF.5: AMM 27-34-00-710-802 / OPERATIONAL TEST OF THE

 ELEVATOR AND HYDRAULIC ACTUATION

 - REF.6: AMM 27-96-00-710-803 / OPERATIONAL TEST OF THE

 FCPC'S AND FCSC'S STANDBY SERVO-LOOPS ON PITCH CONTROL

 - REF.7: TFU 27.34.00.010 / ELEVATOR SERVOCONTROL-UNDUE

 DAMPING MODE / JUNE 2004

 3. REASON

 3.1. FACTS

 ON 11TH OF JUNE 2004, OPERATORS INFORMATION TELEX

 (OIT/REF.2) WAS ISSUED TO INFORM OF AN EVENT CONCERNING AN

 ELEVATOR STUCK IN FULL PITCH DOWN POSITION, WHEN THE

 DAMPING SERVOCONTROL FAILED TO CHANGE TO ACTIVE MODE.

 3.2. INVESTIGATIONS

 EACH ELEVATOR IS EQUIPPED WITH TWO SERVOCONTROLS HAVING

 THREE OPERATING MODES: ACTIVE MODE, DAMPING MODE AND

 CENTERING MODE. THE MODE SELECTION FROM ACTIVE TO DAMPING

 IS ACHIEVED BY A SELECTOR VALVE INSTALLED INSIDE EACH

 SERVOCONTROL. THIS SELECTOR VALVE IS CONTROLLED BY TWO

 IDENTICAL SOLENOID VALVES (PN: EVP504 / REF.1 ITEM 120)

 INSTALLED ON THE SERVOCONTROL.

 EACH SOLENOID VALVE IS SEALED BY O-RING SEALS (REF.1 ITEMS

 80, 130, 140, 150).
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 DURING THE ABOVE DESCRIBED EVENT, THE SERVOCONTROL WAS

 UNABLE TO CHANGE FROM DAMPING TO ACTIVE MODE. THIS IS

 CONSIDERED TO BE DUE TO AN INTERNAL LEAKAGE CAUSED BY A

 CUT/WORN O-RING SEAL (REF.1 ITEM 140) ON ONE SOLENOID

 VALVE.

 A SAMPLING INSPECTION OF THESE SEALS ON IN-SERVICE AIRCRAFT

 AND A REVIEW OF THE SHOP FINDING HISTORY AT GOODRICH

 HIGHLIGHTED SIMILAR WORN SEALS ON A330-200 ELEVATOR

 SERVOCONTROLS WITH MORE THAN 3000 FC ONLY.

 3.3. CONSEQUENCES

 THE INTERNAL LEAKAGE THROUGH THE O-RING SEAL (REF.ITEM 140)

 CAN RESULT IN THE MODE SELECTOR VALVE FAILING TO MOVE TO

 THE ACTIVE POSITION. THIS FAILURE CANNOT BE DETECTED BY THE

 FLIGHT CONTROL PRIMARY COMPUTERS PRE-SB A340-27-4101/4102

 AND A330-27-3097/3098 AND WILL NOT BE ANNOUNCED TO THE

 FLIGHT CREW (REFER TO OIT REF.2).

 3.4. AIM

 AIRBUS REQUESTS THAT A330-200 OPERATORS PERFORM A ONE-TIME

 INSPECTION AND REPLACEMENT OF THE O-RING SEALS INSTALLED ON

 THE TWO SOLENOID VALVES OF THE DAMPING ELEVATOR

 SERVOCONTROLS (POSITIONS 3CS1 AND 3CS2).

 **REV** DUE TO IPC 27-34-51 FIG 1 DISCREPANCY, AIRBUS

 REQUESTS OPERATORS TO COMPLY WITH THE FOLLOWING

 REQUIREMENT:

 IF:

 THE INSPECTION HAS ALREADY BEEN PERFORMED AS

 PER AOT A330 27A3129 DATED 24 JUNE 2004,

 AND,

 THE SEALS WHICH HAVE BEEN INSTALLED ARE PN

 MS28775-XXX OR A PN THAT CANNOT BE IDENTIFIED,

 THEN:

 THE SEALS ARE TO BE REPLACED BEFORE NEXT FLIGHT

 BY REF.1 SEALS PN NAS1611-XXX AS DESCRIBED HEREUNDER:

 ITEM 130: NAS1611-011

 ITEM 140: NAS1611-012

 ITEM 150: NAS1611-013.

 4. SHORT-TERM ACTION

 4.1. PLANNING AND MANPOWER

 ON THE SERVOCONTROLS INSTALLED AT DAMPING POSITIONS 3CS1

 AND 3CS2, THIS INSPECTION AND REPLACEMENT HAS TO BE
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 PERFORMED PRIOR TO:

 - ACCUMULATION OF 3000 FLIGHT CYCLES:

 . SINCE INSTALLATION OF THE SOLENOID VALVE ON THE

 SERVOCONTROL,

 OR

 . BY THE SERVOCONTROL SINCE NEW, IF THE INSTALLATION DATE

 OF THE SOLENOID VALVES CANNOT BE DEFINED,

 OR

 - WITHIN 700 FH FROM THE ISSUANCE DATE OF THIS AOT,

 WHICHEVER OCCURS LATER.

 THE COMPLETE ACTIONS REPRESENT 10 MAN-HOURS AND 5 HOURS

 ELAPSED TIME (TWO MECHANICS ARE REQUIRED).

 4.2. DESCRIPTION

 4.2.1. REMOVAL OF THE SOLENOID VALVES

 ON EACH AFFECTED ELEVATOR SERVOCONTROL, REMOVE THE TWO

 SOLENOID VALVES AS PER AMM 27-34-51-000-804 (REF.3).

 4.2.2. INSPECTION OF THE O-RING SEALS

 VISUALLY INSPECT THE O-RING SEALS (REF.1 ITEMS 80, 130,

 140, 150) OF THE SOLENOID VALVES, AND RECORD THEIR

 CONDITION (OK, WORN, CUT, EXTRUDED). IF POSSIBLE, TAKE

 PICTURES OF ANY DAMAGED SEALS WHILE THEY ARE STILL ON THE

 SOLENOID VALVE.

 4.2.3. REPLACEMENT OF THE O-RING SEALS AND INSTALLATION OF

 THE SOLENOID VALVE

 CAUTION: EXTRACT OF AMM 20-29-00:

 'DO NOT USE POINTED, SHARP OR METAL TOOLS TO REMOVE/INSTALL

 THE O-RING SEALS. SHARP EDGES CAN CAUSE DAMAGE TO THE

 GROOVES OR SEAL CONTACT SURFACES.

 USE SPOON-TYPE REMOVAL TOOLS OR A WEDGE-TYPE REMOVAL TOOL

 WITH A HOOK TO REMOVE/INSTALL THE O-RING SEALS.'

 REPLACE ALL THE O-RING SEALS (REF.1 ITEMS 80, 130, 140,

 150) BY NEW ONES AND RE-INSTALL THE SOLENOID VALVES, AS PER

 AMM 27-34-51-400-804 (REF.4).

 4.2.4. OPERATIONAL TEST OF THE ELEVATORS

 PERFORM THE OPERATIONAL TEST OF THE ELEVATOR AND HYDRAULIC

 ACTUATION, AS PER AMM 27-34-00-710-802 (REF.5).
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 PERFORM THE OPERATIONAL TEST OF THE FCPC'S AND FCSC'S

 STANDBY SERVO-LOOPS ON PITCH CONTROL, AS PER AMM 27-96-00-

 710-803 (REF.6)

 4.2.5. REPORT THE FINDINGS TO AIRBUS

 **REV** FOLLOWING DATA MUST BE REPORTED TO AIRBUS:

 - INSPECTED AIRCRAFT: MSN, FLIGHT HOURS(FH), FLIGHT

 CYCLES(FC);

 - FOR EACH INSPECTED SERVOCONTROL : PART NUMBER (PN),

 SERIAL NUMBER (SN), FH, FC, POSITION ON AIRCRAFT (3CS1,

 3CS2);

 - FOR EACH INSPECTED SOLENOID VALVE: PN, SN, FH, FC,

 CONDITION (OK, WORN, CUT, EXTRUDED,.) OF EACH INSPECTED O-

 RING SEAL (REF.1 ITEMS 80, 130, 140, 150);

 - PICTURES OF THE DAMAGED SEALS, IF AVAILABLE.

 4.3. MATERIAL-TOOLING

 FOR EACH INSPECTED SERVOCONTROL:

 **REV** IPC 27-34-51-1/-1A ITEM 80 - PN NAS1611-112 -

 QTY 02

 IPC 27-34-51-1/-1A ITEM 130 - PN NAS1611-011 -

 QTY 02

 IPC 27-34-51-1/-1A ITEM 140 - PN NAS1611-012 -

 QTY 02

 IPC 27-34-51-1/-1A ITEM 150 - PN NAS1611-013 -

 QTY 02

 CAUTION: SEALS WITH PN MS28775-XXX MUST NOT BE

 USED TO REPLACE THE SEALS IN SOLENOID VALVES.

 IN CASE OF SPARE UNAVAILABILITY, ORDERS FOR SPARE O-RING

 SEALS SHOULD BE ADRESSED TO:

 GOODRICH AOG CONTACT:

 WORLDWIDE: TEL. +44/121.451.5904

 FAX +44/121.451.6133

 E-MAIL: aog.helpdesk@goodrich.com

 NORTH AMERICA: TEL. +1.800.735.7899

 NO SPECIFIC TOOLING IS REQUIRED FOR THIS INSPECTION.

 5. FURTHER ACTION

 THE REASON FOR THE DAMAGED SEAL IS STILL UNDER

 INVESTIGATION.
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 A MODIFICATION OF THE SOLENOID VALVE OF THE SERVOCONTROL

 (DIFFERENT SEALING) IS BEING CONSIDERED.

 FURTHER INFORMATION WILL BE PROVIDED THROUGH TECHNICAL

 FOLLOW-UP 27.34.00.010 (TFU REF.7) DATED JUNE 2004.

 6. AOT APPROVAL

 THE TECHNICAL CONTENT OF THIS AOT HAS BEEN APPROVED UNDER

 THE AUTHORITY OF FRENCH DGAC DESIGN ORGANISATION APPROVAL

 NUMBER F-JA.02.

 7. REPORTING/ACKNOWLEDGEMENT

 OPERATORS ARE REQUESTED TO ACKNOWLEDGE RECEIPT OF THIS AOT

 TO:

 MR R. LASCOURS, SEQ,

 SITA CODE TLSBT7X,

 FAX NUMBER +33/(0)5.61.30.00.79

 WITHIN 48 HOURS AFTER RECEIPT.

 THIS ACKNOWLEDGMENT CAN BE MADE THROUGH THE AIRBUS RCSR

 OFFICE WHEN AVAILABLE.

 FINDINGS FROM INSPECTIONS ARE TO BE SENT TO:

 AIRBUS CUSTOMER SERVICES, ENGINEERING AND TECHNICAL

 SUPPORT, ATTENTION:

 MR. C. HERVAGAULT, SEE53,

 PHONE +33/(0)5.62.11.75.29,

 FAX +33/(0)5.61.93.44.25.

 E-MAIL: cedric.hervagault@airbus.com

 QUESTIONS ABOUT THE TECHNICAL CONTENT OF THE AOT ARE ALSO

 TO BE ADDRESSED TO MR. C. HERVAGAULT.

 BEST REGARDS,

 J. GROTHER

 A330/A340 PROGRAM VICE PRESIDENT

 ENGINEERING AND TECHNICAL SUPPORT

 CUSTOMER SERVICES DIRECTORATE

 IF YOU RECEIVE THIS MESSAGE VIA E-MAIL/INTERNET, WE DRAW

 YOUR ATTENTION TO THE FACT THAT IT MAY BE MONITORED AND/OR

 INTERCEPTED. FURTHER, WHILST AIRBUS HAS TAKEN REASONABLE

 MEASURES TO ENSURE THE INTEGRITY OF THIS MESSAGE AND ITS

 CONTENTS, NO WARRANTY, WHETHER EXPRESS OR IMPLIED, IS GIVEN

 THAT THE CONTENTS HEREOF CONFORM TO THE ORIGINAL. IN CASE

 OF ANY DOUBT, PLEASE RETRIEVE THIS DOCUMENT FROM YOUR SITA

 ADDRESS OR THE AIRBUS AOLS SYSTEM OR REQUEST THAT IT BE
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 RETRANSMITTED BY FAX OR TELEX.