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Page 1 of 2 ATA Ref. 76-03 01-February-2021 Service Bulletin V6/0063
SERVICE BULLETIN TRANSMITTAL SHEET ENGINE CONTROLS – BINDING OF THE FCU PUSH ROD END BEARINGS Service Bulletin No.: V6/0063 Date of Original Issue: 07 June 2019 Revision No: A Date of Issue: 01 February 2021 This Service Bulletin is to notify operators of reports of binding of the MOD 6/2347 Fuel Control Unit (FCU) push rods, P/N C6CE1398-7.
NOTE 1: NEW ACTIONS ARE ADDED AT REVISION ‘A’ OF THIS SERVICE BULLETIN.
NEW ACTIONS ARE REQUIRED ON ALL AIRCRAFT, INCLUDING AIRCRAFT INSPECTED TO THE PREVIOUS ISSUE OF THIS SERVICE BULLETIN.
NOTE 2: This revision supersedes the previous revision of this Service Bulletin.
NOTE 3: Revision bars in the left margin of this Service Bulletin indicate changes from the previous revision.
This page tr ansmits Revision ‘A’ of Service Bulletin V6/0063, pages 1 thru 8, dated 01 February 2021.
This Service Bulletin is re-issued to:
1.
Extend lubrication requirement of Mod 6/2347 rod ends to all operating environments.
2.
Add special instruction for re-entry into service after a period of non-utilization.
3.
Introduce calendar time threshold to do initial inspections in accordance with (IAW) Sections II.A and II.B.
4.
Introduce repeat inspections IAW Sections II.A and II.B. until incorporation of Mod 6/2484.
5.
Prohibit Mod 6/2347 FCU push rod Assemblies for future installation.
Remove Service Bulletin V6/0063 Revision ‘NC’ dated 07 June 2019 and replace with attached.
Previous issues of Service Bulletin V6/0063:
Initial Issue – Pages 1 thru 8 dated 07 June 2019
Page 2 of 2 ATA Ref. 76-03 01-February-2021 Service Bulletin V6/0063
THIS PAGE INTENTIONALLY LEFT BLANK
1959 de Havilland Way Sidney, B.C.
Canada V8L 5V5 Tel: (250) 656 - 7227
01-February-2021 S.B. V6/0063 Revision ‘A’ Page 1 of 8
DHC-6
TWIN OTTER
SERVICE BULLETIN ATA SYSTEM: 76-03 NUMBER: V6/0063
I. PLANNING INFORMATION A. Effectivity Aircraft Affected: DHC-6 aircraft with MOD 6/2347 or equivalent incorporated (including partial incorporation), All Series.
B. Reason There have been reports of binding of the VSC30-3A rod end bearings used in the linkage for the fuel control unit push rod assembly P/N C6CE1398-7. The binding of the FCU push rod bearings was discovered when one engine failed to return to lower power settings from a higher power setting. In at least one case, this was the result of using a lubricant not approved for use in the Maintenance Manuals to lubricate the rod end.
C. Description Revision ‘A’ of this Service Bulletin is issued to extend lubrication requirement of Mod 6/2347 rod ends to all operating environments, and to add repeat inspections. A function check, and lubrication is required after a period of non-utilization of the aircraft before re-entry into service.
Mod 6/2484 FCU push rods and supporting Technical Bulletin No. TB V6/00155 are introduced.
Mod 6/2347 rod ends (and equivalent) are continued to be inspected and lubricated until incorporation of Mod 6/2484.
NOTE: Mod 6/2347 Lower FCU push rod assemblies, sub-assemblies, rod end bearings, and their equivalents are prohibited for future replacement.
D. Compliance NOTE: If Service Bulletin V6/0063 Revision ‘NC’ has already been accomplished, compliance item I.D.3 of Revision ‘A’ is considered to be complied with. However, compliance items I.D.1, I.D.2, and I.D.4 through I.D.7 are still required.
Compliance contains 7 requirements:
1. Following any period of non-utilization of one or more months, before next flight:
a) Check Mod 6/2347 FCU push rod (C6CE1398-7 and equivalent) for freedom of movement in accordance with (IAW) the procedures in Section II.A.
b) Lubricate the lower FCU push rod ends IAW Section II.C and the applicable maintenance manual.
SUBJECT: ENGINE CONTROLS – BINDING OF THE FCU PUSH ROD END BEARINGS
SERVICE BULLETIN V6/0063 01-February-2021 S.B. V6/0063 Revision ‘A’ Page 2 of 8
2. If lower FCU push rod ends have not been previously lubricated IAW Service Bulletin V6/0063 Revision ‘NC’, within seven (7) days or before next flight, whichever occurs later, lubricate the lower FCU push rods IAW Section II.C and the applicable maintenance manual.
3. If not already accomplished IAW Revision ‘NC’ of this Service Bulletin, within seven
(7) days or before next flight, whichever occurs later:
a) Check Mod 6/2347 FCU push rod (C6CE1398-7 and equivalent) for freedom of movement IAW the procedures in Section II.A.
b) FCU push rod(s) not rejected during check IAW Section II.A must be inspected IAW the procedures in Section II.B.
c) Serviceable FCU push rod(s) must be re-checked for freedom of movement IAW the procedures in Section II.A after re-installation.
4. If any rod end is found unserviceable during any function check or inspection IAW this Service Bulletin and the applicable maintenance manual, remove both Mod 6/2347 FCU push rods and incorporate Mod 6/2484 IAW Section II.D before further flight.
5. Every A Check (125 hour inspection), in conjunction with PSM 1-6-7, Part 1, Basic Inspection – 76, Item 3.(1), repeat the check for freedom of movement IAW procedures in Section II.A, and lubricate IAW Section II.C and the applicable maintenance manual.
6. Every 3C Check (1500 hour inspection), disconnect one end at a time and inspect in-situ IAW procedures in Section II.B.
7. All unserviceable FCU push rods must be reported to Viking Technical Support within 10 days. Refer to the operator reply form at the end of the Service Bulletin.
8. Incorporation of Mod 6/2484 is the terminating action to this Service Bulletin.
E. Approval The technical content of this Service Bulletin has been approved under the authority of Transport Canada Civil Aviation (TCCA) Design Approval Organization (DAO) 04-V-02.
F. Labour Requirements Estimated time to accomplish this Service Bulletin is 4 hours.
G. Weight and Balance Not affected.
H. Electrical Load Data Not affected.
I. Publications Affected PSM 1-6-7 Inspection Requirements Manual, All Series PSM 1-6-7(IC) EMMA Inspection Work Cards PSM 1-6-2 Series 100/200 Maintenance Manual PSM 1-63-2 Series 300 Maintenance Manual PSM 1-63S-2 Series 300 Short Nose Maintenance Manual PSM 1-64-2 Series 400 Maintenance Manual PSM 1-6-4 Illustrated Parts Catalogue, Series 100/200 PSM 1-63-4 Illustrated Parts Catalogue, Series 300 Maintenance Manual PSM 1-64-4 Illustrated Parts Catalogue, Series 400 Maintenance Manual
SERVICE BULLETIN V6/0063 01-February-2021 S.B. V6/0063 Revision ‘A’ Page 3 of 8 J. References PSM 1-6-2 Series 100/200 Maintenance Manual PSM 1-63-2 Series 300 Maintenance Manual PSM 1-63S-2 Series 300 Short Nose Maintenance Manual PSM 1-64-2 Series 400 Maintenance Manual TB V6/00155 Technical Bulletin, MOD 6/ 2484 ENGINE CONTROLS - FCU PUSH ROD
ASSEMBLY REPLACEMENT This Service Bulletin is self-contained. No drawings are supplied. For more information please contact:
Viking Air Limited FAX: 403-295-8888 Technical Support Telephone Numbers:
7757 8th Street NE Regional: 587-430-0572 Calgary, Alberta North America: 1-800-663-8444 Canada, T2E 8A2 dh_technical.support@vikingair.com
II. ACCOMPLISHMENT INSTRUCTIONS A. FCU PUSH RO D BINDING CHECK
1. Grasp the FCU push rod between the nut and forward rod end (refer to Figure 1).
2. Push the FCU push rod forward to extend the spring on the FCU Actuating Lever.
3. Release the FCU push rod to allow the spring to return the FCU Actuating Lever to the idle position.
4. If the FCU Actuating Lever does not fully return to idle position (against the idle stop) or returns slowly to idle position, the FCU push rod is unserviceable. Remove both Mod 6/2347 FCU push rods and incorporate Mod 6/2484 before next flight in accordance with Section II.D. Repeat check for binding (steps 1. through 3.) after replacement and rigging check.
B. INSPECTION OF MOD 6/ 2347 FCU PUSH ROD ENDS
1. Remove FCU push rod Assemblies IAW the applicable maintenance manual:
PSM 1-6-2 Part 5, Section 5.24.3 PSM 1-63-2 Chapter 76, Section 76-10-05 PSM 1-63S-2 Chapter 76, Section 76-10-05 PSM 1-64-2 Chapter 76, Section 76-10-05
2. Clean FCU push rod ends IAW the applicable maintenance manual:
PSM 1-6-2 Part 5, Section 5.24.3 PSM 1-63-2 Chapter 76, Section 76-10-05 PSM 1-63S-2 Chapter 76, Section 76-10-05 PSM 1-64-2 Chapter 76, Section 76-10-05 NOTE: If the lubricant is darker than the normal colour, and/or where the lubricant is stickier than the normal texture, the rod ends are unserviceable. Remove both Mod 6/2347 FCU push rods and incorporate Mod 6/2484 in accordance with Section II.D before next flight.
SERVICE BULLETIN V6/0063 01-February-2021 S.B. V6/0063 Revision ‘A’ Page 4 of 8
3. Inspect Mod 6/2347 FCU push rod ends IAW the applicable maintenance manual:
PSM 1-6-2 Part 5, Section 5.24.3 PSM 1-63-2 Chapter 76, Section 76-10-05 PSM 1-63S-2 Chapter 76, Section 76-10-05 PSM 1-64-2 Chapter 76, Section 76-10-05 NOTE: Pay particular attention to the bearing ball and race for corrosion on the ball and chips missing from the edge of the race (refer to Figure 2).
4. Lubricate Mod 6/2347 FCU push rod ends IAW Section II.C.
5. Reinstall FCU push rod IAW the applicable maintenance manual:
PSM 1-6-2 Part 5, Section 5.24.3 PSM 1-63-2 Chapter 76, Section 76-10-05 PSM 1-63S-2 Chapter 76, Section 76-10-05 PSM 1-64-2 Chapter 76, Section 76-10-05
6. Check rigging and free movement of linkage as per applicable maintenance manual:
PSM 1-6-2 Part 5, Section 5.24.2 PSM 1-63-2 Chapter 76, Section 76-10-01 PSM 1-63S-2 Chapter 76, Section 76-10-01 PSM 1-64-2 Chapter 76, Section 76-10-01
7. Complete attached Inspection Reply Form on Page 7, and return to Viking Technical Support within 30 days from date of the inspection C. LUBRICATION OF MOD 6/2347 FCU PUSH ROD ENDS FOR CORROSION
PREVENTION NOTE: Lubrication of Mod 6/2347 FCU push rod ends is required for all operating environments.
CAUTION USE OF LUBRICANT OTHER THAN THOSE LISTED MAY RESULT IN ROD END BINDING AND/OR CORROSION.
CAUTION EXCESSIVE SOLVENT MAY DAMAGE DRY FILM SELF-LUBRICANTING COATING. DO NOT USE EXCESSIVE SOLVENT TO CLEAN ROD END BALL. DO NOT SOAK ROD END.
1. Solvent clean rod ends on the FCU push rod.
2. Lightly lubricate rod ends with Royco 363 lubricating oil, or with Aeroshell Grease 22 lubricating grease.
NOTE: Mixing different lubricants can result in degradation of the lubricant properties and/or damage to the rod end. All unknown or incompatible lubricant previously applied must be removed before re-lubrication.
SERVICE BULLETIN V6/0063 01-February-2021 S.B. V6/0063 Revision ‘A’ Page 5 of 8 D. FCU PUSH ROD REPLACEMENT
1. Incorporate Mod 6/2484 IAW Technical Bulletin TB V6/00155 – MOD 6/2484 ENGINE CONTROLS - FCU PUSH ROD ASSEMBLY REPLACEMENT.
For aircraft S/N 934 and subsequent, use Mod Kit C6MK2484-1.
For aircraft S/N 933 and previous, use Mod Kit C6MK2484-3.
NOTE: Mod 6/2384 is a prerequisite for Mod 6/2484. Mod 6/2384 cut-in at production on aircraft S/N 934.
2. Incorporation of Mod 6/2484 is the terminating action to this Service Bulletin.
E. RECORDING On completion of this Service Bulletin, make the following entry in aircraft log book:
“Service Bulletin No. V6/0063 Revision ‘A’ has been accomplished – Engine Controls – Binding of the FCU Push Rod End Bearings.”
III. MATERIAL INFORMATION AND TOOLING A. Material Information (Par ts Required Per Aircraft) In accordance with TB V6/00155:
C6MK2484-1 Mod Kit for aircraft S/N 934 and subsequent C6MK2484-3 Mod Kit for aircraft S/N 933 and previous Includes Mod 6/2384, which is a prerequisite for Mod 6/2484 B. Tooling – Price and Availability Standard aviation hand tools C. Material (supplied by Operator)
- Cleaning solvent IAW the applicable maintenance manual
- Cloth, coarse weave
- Cloth, lint free
- Royco 363 Lubricating oil
- AeroShell Grease 22, General purpose, wide temperature range
SERVICE BULLETIN V6/0063 IN. FIGURES POWER
CONTROL
RIGGING PIN HOLE PULLEY CAM FOLLOWER LEVER FCU LEVER ACTUATING PUSH-PULL
POWER CONTROL PUSH ROD 0.35 IN. (TELEFLEX)
CONTROL ROD)
FCU CONTROL ROD
•SPRING
FORWARD SPRING PLATE
STOP BOLT FCU
FCU CONTROL CAM FOLLOWER REVERSING
ROD DISCONNECTED PIN LEVER NUT Figure 1 - FCU Rod End Bearing mm Figure 2 - Example of chip missing from rod end race 01-February-2021 S.B. V6/0063 Revision 'A' Page 6 of 8
SERVICE BULLETIN V6/0063 01-February-2021 S.B. V6/0063 Revision ‘A’ Page 7 of 8 Service Bulletin V6/0063 Revision ‘A’ – Operator Reply Form Operator: Date of Inspection:
Contact Person:
Contact Phone/Email:
A/C Registration # A/C Serial
A/C TTSN A/C CSN LH Engine FCU Push Rod Assembly P/N:
RH Engine FCU Push Rod Assembly P/N:
LH FCU Push Rod TTSN TCSN RH FCU Push Rod TTSN TCSN Date of incorporation of Section II.A into maintenance inspection program:
Date of incorporation of Section II.B into maintenance inspection program:
Any occurrences of MOD 6/2347 FCU Push Rod binding to date? : YES NO If ‘YES’: Date of occurrence : yyyy _________ mm _____ dd _____ LH RH TTSN TCSN Were rod ends previously lubricated? YES NO If ‘YES’ Lubrication Accomplished at TTSN _________________ TCSN Was corrosion found on rod end ball? YES NO If ‘YES’: Tropical (between tropics of Cancer and Capricorn or Temperate (outside of tropics of Cancer and Capricorn) Additional Details of Findings:
Corrective Actions:
Please return form via email to dh_technical.support@vikingair.com or via fax to 403-295-8888
SERVICE BULLETIN V6/0063 01-February-2021 S.B. V6/0063 Revision ‘A’ Page 8 of 8