TB 1--1520--240--20--136
(b) Boeing Company will inspect DD 250 aircraft prior to those aircraft departing for ferry to
final destination.
e. Maintenance Trainers (Category A and B). Same as paragraph 1a.
f. Component/Parts in Stock at All Levels (Depot and Others). Including War Reserves --
Upon receipt of this Technical Bulletin, Depot and Materiel Activity Commanders will ensure the materiel con-
dition tags of all items in all condition codes listed in paragraphs 6 and 7 are annotated to read "SOF
CH-47-01-02 (TB 1-1520-240-20-136), Inspection of Droop Stops Not Complied With."
(1) Wholesale Stock -- Upon receipt of this message, Depot and Materiel Activity Commanders
will ensure all serviceable items (condition codes //A//, //B//, //C//, //D// and //E//) listed in paragraphs 6 and
7 located in Wholesale Depot Storage shall be placed in condition code //J// and tagged with a suspended
Tag/Label -- Materiel, DD Form 1576/DD Form 1576--1. Do not remove original condition tags. Report com-
pliance with this Technical Bulletin in accordance with paragraph 14D (1).
(2) Retail Stock -- Upon receipt of this message, Commanders and Facility Managers maintain-
ing retail stock at Installation level and below shall contact the supported aviation unit to perform the proce-
dures required in accordance with paragraphs 8 and 9 on suspect materiel. Report compliance with this Tech-
nical Bulletin in accordance with paragraph 14D (2).
g. Components/Parts in Work (Depot Level and Others) -- Depot and other Maintenance Activity Com-
manders will ensure items listed in paragraphs 6 and 7 are not issued until they are in compliance with this
Technical Bulletin.
next engine start (rotors turning), but no later than 12 February 2001.
than 12 February 2001.
4.
Summary of the Problem.
a. While conducting an accident investigation, incorrectly installed droop stops were discovered.
b. For manpower/downtime and funding impacts see paragraph 12.
c. The purpose of this Technical Bulletin is to perform a one time inspection for proper installation of
droop stops. Aircraft with all droop stops installed correctly will be cleared for engine starts (rotors turning)
and subsequent flight. Aircraft with any improperly installed droop stops will remain grounded until further
guidance is provided in a follow--on Safety of Flight (SOF) message.
5.
End Items to be inspected. All CH--47D and MH--47D/E Aircraft.
Assembly Components to be Inspected.
NOMENCLATURE
PART NUMBER
NATIONAL STOCK NUMBER
ROTOR HEAD
145R2003-All
N/A
ROTOR HEAD
145R2004-All
N/A
7.
Parts to be Inspected.
NOMENCLATURE
PART NUMBER
NATIONAL STOCK NUMBER
DROOP STOP, FWD
114R2063-7
1615-00-967-9759
DROOP STOP, AFT
114R2087-3
1615-01-199-1785
Inspection Procedures.
a. Prepare aircraft for safe ground maintenance.
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