01 14 061726Z NOV 95 PP PP UUUU
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FROM
:CDRATCOM ST LOUIS MO//AMSAT-R-X//
TO
:AIG 8881
:AIG 9004
:AIG 8708
:AIG 9042
:AIG 7471
:AIG 12124
:USMILGP BUENOS AIRES AR//ARMY AND AF SEC//
:DEFAIR MATERIAL CANBERRA AS//DAAP-AF//
:ARMYLMSQN OAKEY AS
:AVN REGT HQ SQN OAKEY AS//DAVN-A//
:CDRUSARDSG CANBERRA AS
:LOGCON OTTAWA CAN//DTHEM 6-2//
:ARGENTINE AIR ATTACHE FMS WASHINGTON DC
: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//
: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//
:SPAIN ARMY FMS MADRID SP
:AIT TAIPEI TW
:TAIWAN ARMY FMS TAIPEI TW
:CJUSMAG THAI BANGKOK TH//MAGTAR-FS//
:ROYAL THAI ARMY FMS/DUSIT ORDNANCE DEP BANGKOK TH
:CDRUSARDSG LONDON UK//AMXSN-UK-SE//
:ODC LONDON UK
INFO
: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
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TEXT
:UNCLAS
SUBJECT - AVIATION SAFETY ACTION MESSAGE, MAINTENANCE
MANDATORY, ALL CH-47D, MH-47D, AND MH-47E HELICOPTERS,
REPLACEMENT OF AFT LANDING GEAR DRAG LINK ASSEMBLIES THAT
ARE SUSCEPTIBLE TO STRESS CORROSION CRACKING. (CH-47-96-
ASAM-01) (TB 1-1520-240-20-80)
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 - SAME AS PARA 1A.
C. AIRCRAFT UNDERGOING MAINTENANCE - SAME AS PARA 1A.
D. AIRCRAFT IN TRANSIT -
(1) SURFACE/AIR SHIPMENT - SAME AS PARA 1A.
(2) FERRY STATUS -
(A) SAME AS PARA 1A.
(B) THOSE AIRCRAFT THAT HAVE A DD250
AND ARE AT BOEING HELICOPTER COMPANY WILL BE INSPECTED PRIOR
TO FERRY TO FINAL DESTINATION FOR THE -5 OR LATER
CONFIGURATION OF DRAG LINK WITH BOEING P/N 114L2323. IF A
CONFIGURATION BEFORE P/N 114L2323-5 IS FOUND THEN THE STATUS
IS THE SAME AS PARA 1A.
E. MAINTENANCE TRAINERS (CATEGORY A AND B) - SAME AS
PARA 1A.
F. COMPONENT/PARTS IN STOCK INCLUDING WAR RESERVES AT
ALL LEVELS (DEPOT AND OTHERS) - N/A
2. TASK/INSPECTION SUSPENSE DATE -
(A) SIXTY (60) DAYS TO INSPECT AND ORDER THE LINK
ASSEMBLY (P/N 1142329-2, NSN 1620-00-107-4529) AND ATTACHING
HARDWARE, IF NEEDED. CONTINUE TO CHECK THE STATUS OF THE
REQUISITION. WHEN THE LINK ASSEMBLY IS RECEIVED, MAKE
CERTAIN THAT THE NECESSARY ATTACHING HARDWARE IS ALSO
RECEIVED.
(B) TWENTY FOUR (24) MONTHS FROM THE DATE OF THIS
MESSAGE TO RECEIVE AND REPLACE THE COMPONENT.
3. REPORTING COMPLIANCE SUSPENSE DATE - NO LATER THAN 28
NOV 95 PER PARA 14A OF THIS MESSAGE.
4. SUMMARY OF PROBLEM -
A. SEVERAL INSTANCES HAVE BEEN REPORTED OF FAILED AFT
LANDING GEAR DRAG LINKS. THE INVESTIGATION REVEALED THAT
THE CAUSE TO BE STRESS CORROSION CRACKING (SCC). THE CRACK
ORIGINATED INSIDE THE BORE, WHERE THE LINK MATES WITH THE
LARGE PIN ATTACHED TO THE AIRCRAFT FRAME. THE CRACK
CONTINUED TO PROPAGATE UNTIL THE LINK FAILED BY OVERLOAD .
B. IN SOME CASES THE LINK FAILED WITH THE AIRCRAFT
SITTING ON THE GROUND. THE CRACK ORIGINATED INSIDE THE
ASSEMBLY AND WAS NOT EXTERNALLY VISIBLE UNTIL THE LINK HAD
COMPLETELY FAILED.
C. SCC CAN OCCUR IN ALUMINUM ALLOYS WITH CERTAIN
COMBINATIONS OF THE FOLLOWING FACTORS: SECTION THICKNESS,
TEMPER, TENSILE STRESSES AND ENVIRONMENT. THE NEW DRAG
LINKS (P/N 114L2323-5) ARE MANUFACTURED FROM ALUMINUM ALLOYS
THAT ARE RESISTANT TO SCC. THE LINK ASSEMBLY (P/N 114L2329-
2) INCLUDES THE DRAG LINK (P/N 114L2323-5) AND SLEEVE
BUSHINGS (P/N 114L2357-1).
D. A TEAM FROM CORPUS CHRISTI ARMY DEPOT (CCAD) HAS
TRAVELED TO ALL THE CHINOOK UNITS AND INSPECTED THE TWO AFT
DRAG LINKS. THE INSPECTION CONSISTED OF A CONDUCTIVITY
MEASUREMENT OF THE ALUMINUM LINK. THE MEASUREMENTS WILL
SEPARATE LINKS SUSCEPTIBLE AND THOSE THAT ARE RESISTANT TO
SCC. THE LINKS THAT COULD FAIL FROM SCC WERE PAINTED/MARKED
WITH 1 1/2 INCH HIGH NUMBER "3". THE LINKS THAT ARE
RESISTANT TO SCC WERE IDENTIFIED WITH NUMBER "5".
E. FOR MANPOWER/DOWNTIME AND FUNDING IMPACTS SEE PARA 12.
F. THE PURPOSE OF THIS MESSAGE IS TO:
(1) INSPECT THE AFT LANDING GEAR DRAG LINK FOR
THE NUMBER MARKED BY CCAD WITHIN 60 DAYS.
(2) REPLACE THE "3" CONFIGURATION WITH A "5"
CONFIGURATION WITHIN 24 MONTHS FROM THE DATE OF THIS MESSAGE.
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
AFT LANDING GEAR ASSEMBLY 114L2329-2 1620-00-107-4529
AFT LANDING GEAR ASSEMBLY 114L2329-3 1620-00-107-4529
7. PARTS TO BE INSPECTED - N/A.
8. INSPECTION PROCEDURES -
A. PERFORM A ONE TIME VISUAL INSPECTION OF THE AFT
LANDING GEAR DRAG LINKS (TM 55-1520-240-23P, FIGURE 148,
ITEM 24 OR TM 1-1520-252-23P, FIGURE 3-2, ITEM 24) FOR A
NUMBER "3" OR "5" PAINTED/MARKED ON THE LINK.
B. IF A "5" IS FOUND, ANNOTATE IN THE LOG BOOK THAT THE
"5" CONFIGURATION IS ON THE AIRCRAFT. NO FURTHER ACTION IS
REQUIRED AND THE ASAM IS COMPLETE.
C. IF A "3" OR NO PAINTED/MARKED NUMBER IS FOUND ON THE
DRAG LINK, PROCEED TO PARAGRAPH 9.
9. CORRECTION PROCEDURES -
NOTE
DO NOT PAINT OVER "3" OR "5" LOCATED ON LINK.
A. IF A NUMBER "3" IS PAINTED/MARKED ON THE LINK OR NO
PAINTED/MARKED NUMBER IS FOUND, ORDER THE NEW LINK ASSEMBLY
(P/N 114L2329-2, NSN 1620-00-107-4529). FROM THE DATE OF
THIS ASAM, UNITS HAVE 24 MONTHS TO CHANGE OUT "3" LINKS AND
THOSE WITHOUT MARKINGS FROM THE AIRCRAFT.
NOTE
THE LINK ASSEMBLY (P/N 114L2329-2) INCLUDES THE DRAG LINK
(P/N 114L2323-5) AND SLEEVE BUSHINGS (P/N 114L2357-1).
NOTE
TWENTY FOUR MONTHS IS NEEDED FOR DLA TO PROCURE SUFFICIENT
QUANTITY OF THE NEW DRAG LINKS TO SUPPORT THE FIELD. ENSURE
REQUISITIONS ARE SUBMITTED AND CONTINUE TO MONITOR STATUS.
B. DO NOT REMOVE THE DRAG LINK FROM THE AIRCRAFT UNTIL
A NEW DRAG LINK AND HARDWARE HAVE BEEN RECEIVED. THERE ARE
NO MORE 114L2323-3 DRAG LINKS IN THE SUPPLY SYSTEM. ALL
DEPOT STOCK AND FUTURE REQUISITIONS WILL HAVE DRAG LINKS
MADE FROM A MATERIAL/TEMPER THAT IS RESISTANT TO STRESS
CORROSION CRACKING (P/N 114L2323-5). THE LINKS FROM THE
DEPOT WILL NOT BE IDENTIFIED WITH "3" OR "5" BUT ARE
ACCEPTABLE TO USE. WHEN THE DRAG LINKS ARE RECEIVED, THE
UNITS SHALL MARK THEM WITH "5" AND PROCEED TO REMOVE AND
REPLACE THE LINKS PER TM 55-1520-240-23, TASKS 3-45 THROUGH
3-48 OR TM 1-1520-252-23, TASK 3-48 THROUGH 3-51.
10. SUPPLY/PARTS AND DISPOSITION -
A. PARTS REQUIRED - ITEMS CITED IN PARAGRAPHS 6 MAY BE
REQUIRED TO REPLACE DEFECTIVE ITEMS. THE FOLLOWING HARDWARE
MAY ALSO BE REQUIRED TO BE REPLACE THE DRAG LINK:
NOMENCLATURE PART NUMBER NSN
PIN, COTTER MS24665-378 5315-00-899-4118
WASHER, FLAT AN960-616L 5310-00-167-0837
PIN, COTTER MS24665-447 5315-00-239-8030
NUT, CASTELLATED MS21025-28 5310-00-838-0264
WASHER, FLAT 114L2378-1 5310-00-880-4518
PIN, FULCRUM 114L2356-1 5315-00-868-9794
NUT, SELF-LOCKING MS21083N6 5310-00-926-1852
BOLT, MACHINE AN6-37A 5306-00-275-9560
NUT, PLAIN CASTEL AN310-16 5310-00-167-1294
WASHER, FLAT 114L2054-1 5310-00-865-9359
PIN, TRUNNION 114L2353-1 5315-00-869-0719
B. REQUISITIONING INSTRUCTIONS - REQUISITION
REPLACEMENT PARTS THROUGH NORMAL SUPPLY CHANNELS USING
NORMAL SUPPLY PROCEDURES. ALL REQUISITIONS SHALL USE
PROJECT CODE "XBN" PER THIS MESSAGE.
NOTE
PROJECT CODE "XBN" 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. A QDR IS NOT
REQUIRED.
E. DISPOSITION OF HAZARDOUS MATERIAL - IN ACCORDANCE
WITH ENVIRONMENTAL PROTECTIVE AGENCY DIRECTIVES AS
IMPLEMENTED BY YOUR SERVICING ENVIRONMENTAL COORDINATOR (AR 200-1).
11. SPECIAL TOOLS, JIGS AND FIXTURES REQUIRED - N/A.
12. APPLICATION -
A. CATEGORY OF MAINTENANCE - AVUM. AIRCRAFT DOWNTIME
WILL BE CHARGED TO AVUM.
B. ESTIMATED TIME REQUIRED - TOTAL OF 14 MANHOURS
USING 3 PERSONS PER DRAG LINK.
C. ESTIMATED COST IMPACT OF STOCK FUND ITEMS TO THE
FIELD -
NOMENCLATURE PART NO. NSN COST EA.
AFT LANDING
GEAR ASSEMBLY 114L2329-2 1620-00-107-4529 $ 7311.12
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 - N/A.
13. REFERENCES -
A. TM 55-1520-240-23, AVIATION UNIT AND INTERMEDIATE
MAINTENANCE MANUAL, CH-47D HELICOPTER, DTD 10 MAY 83 WITH
CHANGES.
B. TM 55-1520-240-23P, AVIATION UNIT AND INTERMEDIATE
MAINTENANCE MANUAL REPAIR PARTS AND SPECIAL TOOLS LIST, CH-
47D HELICOPTER, DTD 1 NOV 89 WITH CHANGES.
C. TM 1-1520-252-23, AVIATION UNIT AND INTERMEDIATE
MAINTENANCE MANUAL, MH-47E HELICOPTER, DTD 28 JUN 95 WITH
CHANGES.
D. TM 1-1520-252-23P, AVIATION UNIT AND INTERMEDIATE
MAINTENANCE MANUAL, MH-47E HELICOPTER, DTD 28 JUN 95 WITH
CHANGES.
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) EMH4.STL.ARMY.MIL". THE
REPORT WILL CITE THIS MESSAGE NUMBER, DATE OF ENTRY IN DA
FORM 2408-13-1, THE AIRCRAFT MISSION DESIGN SERIES AND
SERIAL NUMBERS OF AIRCRAFT IN NUMERICAL ORDER.
B. TASK/INSPECTION REPORTING SUSPENSE DATE (AIRCRAFT)
- N/A.
C. REPORTING COMPLIANCE SUSPENSE DATE (SPARES) - N/A.
D. TASK/INSPECTION REPORTING SUSPENSE DATE (SPARES) - N/A.
E. 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 RECORDS.
(4) DA FORM 2408-14, UNCORRECTED FAULT RECORD.
(5) DA FORM 2408-15, HISTORICAL RECORD FOR AIRCRAFT.
15. WEIGHT AND BALANCE - N/A.
16. POINTS OF CONTACT -
A. TECHNICAL POINTS OF CONTACT FOR THIS MESSAGE ARE
MR. DAVID BRAUN, CONTRACTOR, AND MR. MIKE WRIGHT, AMSAT-R-
ECC, DSN 693-6679/3550 OR COMMERCIAL 314-263-6679/3550,
RESPECTIVELY.
B. LOGISTICAL POINT OF CONTACT FOR THIS MESSAGE IS MR.
NORM HUSTON, SFAE-AV-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 693-1821/1758 OR
COMMERCIAL 314/263-1821/1758.
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, AMSAT-I-IAF, 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.