01 13 132230Z DEC 94 PP PP UUUU
:
FROM
:CDRATCOM ST LOUIS MO//AMSAT-R-X//
TO
:AIG 6713
:AIG 9004
:AIG 8708
:AIG 9042
:DEFARM CAMPBELL AS//DAVN-A//
:DEFARM CANBERRA AS//DOR-A//
:DEFNAV CANBERRA AS
:CDRUSARDSG CANBERRA AS
:LOGCON OTTAWA CAN//DTHEM 6-2//
:EGYPT AF FMS CAIRO EG//ED-MA//
:USOMC CAIRO EG//AV//
:ODC ATHENS GR//ODCSA//
:CDR4THBN228THAVN SOTO CANO HO//AVN-AMO//
:102DARMY SCOTT AFB IL//AFRC-AMO-ASF-IL//
:CHJUSMAG SEOUL KOR//MKAR//
:HQROKA TAEJON KOR//DCSLOG-AVIATION/ROKA-AVIATON//
:ROK ARMY FMS PUSAN KOR//ALC-LSD-L//
:CDR160TH SOAR FT CAMPBELL KY//AOAV-SI//
:CDRBGAD RICHMOND KY//SDSBG-GC//
:USDAO RABAT MO//AF//
:CHUSAS RIYADH SA//ASAV//
:ODC MADRID SP//ASM//
:AIT TAIPEI TW
:CJUSMAG THAI BANGKOK TH//MAGTAR-FS//
:CDRUSARDSG LONDON UK//AMXSN-UK-SE//
:ODC LONDON UK
INFO
:CDRAMCCOM ROCK ISLAND IL//AMSAR-QAS-P//
:CDRAMC ALEXANDRIA VA//AMCMR/AMCCS/AMCSM-WAA//
XMT
:USDAO DHAKA BG
:USDAO RANGOON BM
:USCINCPAC REP PHNOM PENH CB
:USDAO COLOMBO CE
:USDAO SUVA FJ
:OMADP JAKARTA ID
:DSA NEW DELHI IN
:AMEMBASSY ANTANANARIVO MA
:AMEMBASSY PORT LOUIS
:SAO KUALA LUMPUR MY
:AMEMBASSY KATHMANDU NP//POL-MIL//
:AMEMBASSY VICTORIA
:SAO SINGAPORE SN
ACCT
:
TEXT
:UNCLAS
SUBJECT - AVIATION SAFETY ACTION MESSAGE, MAINTENANCE
MANDATORY, RCS CSGLD-1860(R1), ALL CH-47D, MH-47D, AND MH-
47E AIRCRAFT, ONE TIME AND RECURRING DAILY INSPECTION OF
THRUST IDLER ASSEMBLY (CH-47-95-ASAM-01) (TB 1-1520-243-20-1)
NOTE - THIS IS AN AVIATION SAFETY ACTION MESSAGE ISSUED PER
AR 95-3, CHAPTER 5 REVISION VIA MESSAGE HQ AVSCOM, AMSAV-
XSOF, 181900Z SEP 90, SUBJECT: CHANGE TO AR 95-3, CHAPTER
5, SAFETY OF FLIGHT MESSAGES. THIS MESSAGE HAS NOT BEEN
TRANSMITTED TO UNITS SUBORDINATE TO ADDRESSEES. ADDRESSEES
SHOULD IMMEDIATELY RETRANSMIT THIS MESSAGE TO ALL
SUBORDINATE UNITS, ACTIVITIES OR ELEMENTS AFFECTED OR
CONCERNED. THE RETRANSMITTAL SHALL REFERENCE THE MESSAGE.
ACTION ADDRESSES WILL IMMEDIATELY VERIFY THIS
RETRANSMISSION TO COMMANDER, ATCOM, ATTN - AMSAT-R-X (SOF
COMPLIANCE OFFICER).
1. PRIORITY CLASSIFICATION -
A. AIRCRAFT IN USE - UPON RECEIPT OF THIS MESSAGE THE
CONDITION STATUS SYMBOL OF THE CITED AIRCRAFT WILL BE
CHANGED TO A RED HORIZONTAL DASH //-//. THE RED HORIZONTAL
DASH //-// MAY BE CLEARED WHEN THE INSPECTION OF PARA 8
BELOW IS COMPLETED. THE AFFECTED AIRCRAFT SHALL BE
INSPECTED AS SOON AS PRACTICAL BUT NO LATER THAN THE
TASK/INSPECTION SUSPENSE DATE. FAILURE TO COMPLY WITH THE
REQUIREMENTS OF THIS MESSAGE WITHIN THE TIME FRAME WILL
CAUSE THE STATUS SYMBOL TO BE UPGRADED TO A RED //X//.
B. AIRCRAFT IN DEPOT MAINTENANCE - AIRCRAFT WILL NOT BE
ISSUED UNTIL COMPLIANCE WITH THIS ASAM HAS BEEN COMPLETED.
C. AIRCRAFT UNDERGOING MAINTENANCE - SAME AS PARA 1A.
D. AIRCRAFT IN TRANSIT -
(1) SURFACE/AIR SHIPMENT - PRIOR TO FIRST FLIGHT.
(2) FERRY STATUS - INSPECT AT FINAL DESTINATION.
(3) THOSE AIRCRAFT THAT HAVE A DD250 AND ARE AT
BOEING HELICOPTER COMPANY WILL BE INSPECTED PRIOR TO FERRY
TO FINAL DESTINATION.
E. MAINTENANCE TRAINERS (CATEGORY A, B AND C) - COMPLY
WITHIN 14 DAYS OF RECEIPT OF THIS MESSAGE.
F. COMPONENT/PARTS IN STOCK INCLUDING WAR RESERVES AT
ALL LEVELS (DEPOT AND OTHERS) - N/A.
2. TASK/INSPECTION SUSPENSE DATE - PRIOR TO NEXT MISSION
DAY AND EVERY DAILY INSPECTION THEREAFTER.
3. REPORTING COMPLIANCE SUSPENSE DATE - NO LATER THAN 4 JAN
95 PER PARA 14A OF THIS MESSAGE.
4. SUMMARY OF PROBLEM -
A. RECENT FIELD REPORTS INDICATE THAT THE THRUST IDLER
ASSEMBLIES P/N 145C1408-1 ARE BEING DISCOVERED WITH BENT
INBOARD ARMS. AT LEAST ONE CASE OF IN-FLIGHT FAILURE HAS
OCCURRED WHICH RESULTED IN A LOSS OF ENGINE/ROTOR DROOP
ANTICIPATION. THE THRUST IDLER ASSEMBLIES ARE NOT LOADED
LATERALLY DURING THEIR NORMAL MODE OF OPERATION, AND
CONSEQUENTLY, ARE NOT DESIGNED TO WITHSTAND ABNORMAL LATERAL
LOADING. HOWEVER, DRAWINGS WILL BE CHANGED TO REINFORCE THE
THRUST IDLER ASSEMBLY.
B. FOR MANPOWER/DOWNTIME AND FUNDING IMPACTS SEE PARA 12.
C. THE PURPOSE OF THIS MESSAGE IS TO REQUIRE A ONE
TIME AND RECURRING DAILY INSPECTION OF THE THRUST IDLER
ASSEMBLY FOR BENDING AND CRACKING.
NOTE
NO ATTEMPT SHOULD BE MADE TO BEND THE IDLER ARM BACK INTO
ITS NORMAL POSITION.
5. END ITEMS TO BE INSPECTED - ALL CH-47D, MH-47D, AND MH-
47E AIRCRAFT.
6. ASSEMBLY COMPONENTS TO BE INSPECTED -
NOMENCLATURE PART NO. NSN
THRUST IDLER ASSY 145C1408-1 1560-01-116-4206
7. PARTS TO BE INSPECTED - SEE PARA 6.
8. INSPECTION PROCEDURES -
WARNING
DURING MAINTENANCE, PREFLIGHT AND DAILY INSPECTIONS, DO NOT
GRAB THE CONNECTING LINK P/N 145C1420-2 AND INDUCE LATERAL
LOADS TO THE THRUST IDLER ARM. THE THRUST IDLER INBOARD ARM
AND OTHER FLIGHT CONTROLS IN THAT AREA ARE NOT DESIGNED TO
HANDLE LATERAL LOADS AND ARE SUSCEPTIBLE TO BENDING. IF THE
THRUST IDLER INBOARD ARM IS BENT (NOT CRACKED), THE AIRCRAFT
CAN CONTINUE IN SERVICE. IF THE THRUST IDLER INBOARD ARM
BREAKS, IT WILL RESULT IN A DISCONNECTION OF THE THRUST
COCKPIT CONTROL DRIVER ACTUATOR (CCDA) AND THE DROOP
ELIMINATOR POTENTIOMETERS (DROOP POTS). THE LOSS OF THE
CCDA WILL HAVE TWO EFFECTS. IT WILL CAUSE THE AUTOMATIC
FLIGHT CONTROL SYSTEM (AFCS) ALTITUDE HOLD CAPABILITY TO BE
DISABLED ALLOWING THE THRUST LEVER TO CREEP UPWARD OR
DOWNWARD. THE LOSS OF THE DROOP POTS WILL CAUSE ROTOR RPM
TO LAG (DROOP) BEHIND CHANGES IN THRUST SETTINGS. (RPM WILL
DECREASE AS THRUST INPUT IS INCREASED AND VICE VERSA).
A. PERFORM THE FOLLOWING INSPECTION PRIOR TO NEXT
MISSION DAY AND AT EVERY DAILY INSPECTION:
(1) VISUALLY INSPECT THRUST IDLER ASSEMBLY FOR A
BENT OR CRACKED INBOARD ARM. PAY PARTICULAR ATTENTION TO
THE AREA AROUND RIGGING PIN HOLE AREA.
NOTE
A LIMITED NUMBER OF THRUST IDLER ASSEMBLIES ARE IN THE
SUPPLY SYSTEM. AIRCRAFT ON GROUND (AOG) WILL HAVE FIRST
PRIORITY.
(2) IF ARM IS BENT, REQUISITION A REPLACEMENT
THRUST IDLER ASSEMBLY AND REPLACE WHEN PARTS BECOME
AVAILABLE. CONTINUE RECURRING DAILY INSPECTION AND INSPECT
THE INBOARD ARM FOR CRACKS. DO NOT, REPEAT, DO NOT ATTEMPT
TO BEND THE IDLER ARM BACK INTO ITS NORMAL POSITION.
(3) IF ARM IS CRACKED, REPLACE THRUST IDLER
ASSEMBLY PRIOR TO NEXT FLIGHT.
B. COMMANDERS SHALL ENSURE FLIGHT CREWS AND
MAINTENANCE PERSONNEL ARE BRIEFED ON THIS MESSAGE
EMPHASIZING THE INFORMATION IN THE ABOVE WARNING. INSERT A
COPY OF THIS MESSAGE IN THE PILOTS READING FILE.
9. CORRECTION PROCEDURES - SEE PARA 8.
10. SUPPLY/PARTS AND DISPOSITION -
A. PARTS REQUIRED - ITEMS CITED IN PARAGRAPHS 6 MAY BE
REQUIRED TO REPLACE DEFECTIVE ITEMS.
B. REQUISITIONING INSTRUCTIONS - REQUISITION
REPLACEMENT PARTS THROUGH NORMAL SUPPLY CHANNELS USING
NORMAL SUPPLY PROCEDURES. ALL REQUISITIONS SHALL USE
PROJECT CODE "XAP" PER THIS MESSAGE.
NOTE
PROJECT CODE "XAP" IS REQUIRED TO TRACK AND ESTABLISH A DATA
BASE OF STOCK FUND EXPENDITURES INCURRED BY THE FIELD AS A
RESULT OF ASAM/SOF ACTIONS.
C. BULK AND CONSUMABLE MATERIALS - N/A.
D. DISPOSITION - DISPOSE OF REMOVED PARTS/COMPONENTS
IN ACCORDANCE WITH NORMAL SUPPLY PROCEDURES.
E. DISPOSITION OF HAZARDOUS MATERIAL - N/A.
11. SPECIAL TOOLS, JIGS AND FIXTURES REQUIRED - N/A.
12. APPLICATION -
A. CATEGORY OF MAINTENANCE - AVUM. AIRCRAFT DOWNTIME
WILL BE CHARGED TO AVUM.
B. TIME REQUIRED -
(1) TOTAL OF .5 MANHOUR USING 1 PERSON.
(2) TOTAL OF .5 HOUR DOWNTIME FOR ONE END ITEM.
C. ESTIMATED COST IMPACT OF STOCK FUND ITEMS TO THE
FIELD -
NOMENCLATURE PART NO. NSN TOTAL $
THRUST IDLER ASSY 145C1408-1 1560-01-116-4206 $973
D. TB/MWOS TO BE APPLIED PRIOR TO OR CONCURRENTLY WITH
THIS INSPECTION - N/A.
E. PUBLICATIONS WHICH REQUIRE CHANGE AS A RESULT OF
THIS INSPECTION -
(1) TM 55-1520-240-23-9 AND TM 1-1520-252-23-9
SHALL BE CHANGED TO ADD THE FOLLOWING CAUTION WHENEVER THE
IDLER, THE RIGGING PIN, AND THE INSTALLATION OF THE THRUST
LINK ARE REFERENCED:
CAUTION
DO NOT STAND, KICK OR INDUCE LATERAL LOADS TO THE THRUST
IDLER. A CRACKED ARM WILL CAUSE IN-FLIGHT FAILURE RESULTING
IN DISCONNECTING THE THRUST COCKPIT CONTROL DRIVER ACTUATOR
(CCDA) AND THE DROOP ELIMINATOR POTENTIOMETERS (DROOP POTS).
(2) TM 55-1520-240-10/CL/PMD, TM 1-1520-252-
10/CL/PMD SHALL BE CHANGED TO INCLUDE THE DAILY INSPECTION
OF PARA 8.
NOTE
A COPY OF THIS MESSAGE SHALL BE INSERTED IN THE APPROPRIATE
TM AS AUTHORITY TO IMPLEMENT THE CHANGE UNTIL THE PRINTED
CHANGE IS RECEIVED.
13. REFERENCE -
A. TM 55-1520-240-23-9, AVIATION UNIT AND INTERMEDIATE
MAINTENANCE MANUAL, ARMY MODEL CH-47D HELICOPTER, DTD 10 MAY
83, C15 4 APR 94.
B. TM 55-1520-240-10, OPERATORS MANUAL FOR CH-47D
HELICOPTER, DTD 30 APR 92, C2 1 MAR 94.
C. TM 55-1520-240-CL, OPERATORS AND CREWMEMBERS
CHECKLIST FOR CH-47D AIRCRAFT, 30 APR 92.
D. TM 55-1520-240-PMD, PREVENTIVE MAINTENANCE DAILY
FOR CH-47D AIRCRAFT, 6 SEP 88, C6 30 DEC 93.
E. TM 55-1520-252-23-9, AVIATION UNIT AND INTERMEDIATE
MAINTENANCE MANUAL, ARMY MODEL MH-47E HELICOPTER.
F. TM 55-1520-252-10, OPERATORS MANUAL FOR MH-47E
HELICOPTER.
G. TM 55-1520-252-CL, OPERATORS AND CREWMEMBERS
CHECKLIST FOR MH-47E AIRCRAFT.
H. TM 55-1520-252-PMD, PREVENTIVE MAINTENANCE DAILY
FOR MH-47E AIRCRAFT.
14. RECORDING AND REPORTING REQUIREMENTS -
A. REPORTING COMPLIANCE SUSPENSE DATE (AIRCRAFT) -
UPON ENTERING REQUIREMENTS OF THIS MESSAGE ON DA FORM 2408-
13-1 ON ALL SUBJECT MDS AIRCRAFT, FORWARD A PRIORITY
MESSAGE, DATAFAX OR E-MAIL TO COMMANDER, ATCOM, ATTN: AMSAT-
R-X (SOF COMPLIANCE OFFICER), PER AR 95-3. DATAFAX NUMBER
IS DSN 693-2064 OR COMMERCIAL 314/263-2064. E-MAIL ADDRESS
IS "AMSATRXS (AT SIGN) ST-LOUIS-EMH4.ARMY.MIL". THE REPORT
WILL CITE THIS MESSAGE NUMBER, DATE OF ENTRY IN DA FORM 2408-
13, THE AIRCRAFT MISSION DESIGN SERIES AND SERIAL NUMBERS OF
AIRCRAFT IN NUMERICAL ORDER.
B. TASK/INSPECTION REPORTING SUSPENSE DATE (AIRCRAFT)-
IF A CRACKED THRUST IDLER IS FOUND DURING INSPECTION, UNITS
WILL IMMEDIATELY FORWARD A PRIORITY MESSAGE TO: COMMANDER,
ATCOM, ATTN: AMCPM-CH-L (MR. NORM HUSTON) OR DATAFAX DSN 693-
1485 OR COMMERCIAL 314/263-1485. THE REPORT WILL CITE THIS
MESSAGE NUMBER, DATE OF INSPECTION, AIRCRAFT SERIAL NUMBER,
AIRCRAFT HOURS, POC AND PHONE NUMBER.
C. REPORT COMPLIANCE SUSPENSE DATE (SPARES) - N/A.
D. THE FOLLOWING FORMS ARE APPLICABLE AND ARE TO BE
COMPLETED IN ACCORDANCE WITH DA PAM 738-751, 15 JUN 92 -
(1) DA FORM 2408-13, AIRCRAFT STATUS INFORMATION
RECORD.
(2) DA FORM 2408-13-1, AIRCRAFT INSPECTION AND
MAINTENANCE RECORD.
(3) DA FORM 2408-13-2, RELATED MAINTENANCE ACTIONS RECORD.
(4) DA FORM 2408-15, HISTORICAL RECORD FOR
AIRCRAFT.
15. WEIGHT AND BALANCE - N/A.
16. POINTS OF CONTACT -
A. TECHNICAL POINT OF CONTACT FOR THIS MESSAGE IS MR.
MIKE WRIGHT, AMSAT-R-ECC, DSN 693-3550 OR COMMERCIAL 314/263-
3550.
B. LOGISTICAL POINT OF CONTACT FOR THIS MESSAGE IS MR.
NORM HUSTON, AMCPM-CH-L, DSN 693-1415 OR COMMERCIAL 314/263-
1415.
C. FORMS AND RECORDS POINT OF CONTACT FOR THIS MESSAGE
IS MS. ANN WALDECK, AMSAT-I-MDM, DSN 693-1826/1758 OR
COMMERCIAL 314/263-1826/1758.
D. SAFETY POINT OF CONTACT FOR THIS MESSAGE IS MR.
BRAD MEYER, AMSAT-R-X, DSN 693-2085 OR COMMERCIAL 314/263-
2085.
E. FOREIGN MILITARY SALES (FMS) RECIPIENTS REQUIRING
CLARIFICATION OF ACTION ADVISED BY THIS MESSAGE SHOULD
CONTACT CW5 JAY NANCE/MR. RON VAN REES, AMSAV-I-IA, DSN 693-
3826/3659 OR COMMERCIAL 314/263-3826/3659.
F. AFTER HOURS CONTACT ATCOM COMMAND OPERATIONS CENTER
(COC) DSN 693-2066/7 OR COMMERCIAL 314./263-2066/7.