TB 1--1520--240--20--136
b. Perform visual inspection of the three forward droop stops part number 114R2063-7. This stop has
one chamfered edge along its length. If this chamfered edge is installed towards the radius of the pitch shaft's
droop stop boss, the installation is correct.
c. Perform visual inspection of the three aft droop stops part number 114R2087-3 for the following:
(1) This stop shall have a total of four holes. 2 for droop stop installation and 2 holes are for droop
stop shroud shield installation which are located just outboard of the droop stop bolt holes. Shroud may or
may not be installed.
NOTE
The aft droop stop has two chamfered edges but has only one on the
side with bolt holes.
(2) If a chamfered edged is installed facing the radius of the pitch shaft's droop stop boss, the
installation is correct.
9.
a. Aircraft which have all droop stops installed correctly:
Aircraft may perform engine starts (rotors turning) and are cleared for subsequent flight. Compliance with this
Technical Bulletin shall be noted.
b. If an aircraft has one or more incorrectly installed droop stops, change the aircraft condition status
symbol to a red //X// and enter the following statement on the DA Form 2408--13--1: "Aircraft grounded in ac-
cordance with SOF CH--47--01--02 for improperly installed droop stop (s)." Do not perform engine starts (ro-
tors turning) on aircraft with incorrectly installed droop stop (s). Additional information will be forthcoming in
a follow--up message.
10. Supply/Parts and Disposition. N/A.
11. Special Tools and Fixtures Required. N/A.
12. Application.
a. Category of Maintenance -- AVUM. Aircraft downtime will be charged to AVUM Maintenance. Report
aircraft non--mission capable maintenance (NMCM) while undergoing inspection and correction in accor-
dance with this Technical Bulletin.
b. Estimated Time Required-
(1) Total of 1 man--hours using 1 person.
(2) Total of 1 hours downtime for one end item.
c. Estimated Cost Impact to the Field -- N/A.
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. DA PAM 738--751.
b. TM 55-1520-240-23 & P.
a. Reporting Compliance Suspense Date (Aircraft). Upon entering requirements of this Technical Bul-
letin on DA Form 2408-13-1 on all subject MDS aircraft, Commanders will forward a priority message, datafax
or e-mail to Commander, AMCOM, ATTN: AMSAM--SF--A (SOF Compliance Officer), Redstone Arsenal, AL
35898-5000, in accordance with AR 95-1. Datafax number is DSN 897--2111 or commercial (256) 313--2111.
E-Mail address is "safeadm@redstone.army.mil". The report will cite this Technical Bulletin number, date of
entry in DA Form 2408-13-1, the aircraft mission design series and serial numbers of aircraft in numerical
order.
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