TB 1-1520-238-20-120
(7) If bolt holds torque and does not turn --
(a) Mark head of bolt with torque stripe to indicate a recurring torque check is required.
(b) Lockwire the bolt to the strut using the single fastener application, double twist, single
hole method IAW TM 1--1500--204--23--6. This portion of the inspection is complete.
(8) Enter this inspection on the DA Form 2408--18. ULLS--A units use an 800 inspection
number for the 10 hour/14 day bolt torque inspection.
(9) If lockwire is found broken during the recurring torque check, contact the Tech POC in
para 16A immediately.
(10)The recurring torque check is required until the barrel nut and/or bolt are removed and
replaced with a HS5813--12 nut, a redesigned 7--311113224 (when available) nut and/or bolt
HS4243V12H34/62 or HS4243--12H34/62 prior to 2 August 2003 IAW para 9 of this SOF.
Correction Procedures -- Barrel Nut/Bolt Reinstallation and Replacement --
a. Apply primer MIL--P--23377 to the barrel nut retainer. Allow time for primer to cure prior to
installing.
b. Apply anti--seize MIL--T--83483 to nut threads.
c.
Install barrel nut and retainer (if required) in support holes. Lightly tap in place.
NOTE
A retainer is required only for FS 230 and FS 176 with the HS5813--12 nut.
The 7--311113224 nut does not require a retainer.
d. Install washer onto bolt with countersunk side against bolt head.
e. Install bolt through strut in deck. If bolt does not fit freely, adjust sling to align holes as required.
If bolt still does not fit freely, loosen hardware attaching struts to mast base.
f. Torque bolt to 1900 inch--pounds. Use torque wrench and mast support wrench. For nuts and
bolts that require a torque check mark head of bolt with stripe to indicate a recurring torque check is
required.
g. Lockwire bolt to strut --
(1) If bolt HS4243V12H34/62 or HS4243--12H34/62 is installed with an HS5813--12 nut that
exceeds the 50 inch pounds of run--on torque, the double twist--multiple hole method IAW TM
1--1500--204--23--6 will be used.
(a) For any bolts installed with a barrel nut part number other than HS5813--12, or with any
nut that does not exceed the 50 inch pounds of run--on torque, the 10 hour/14 day recurring torque check
is required and the single fastener application, double twist, single hole method IAW TM
1--1500--204--23--6 will be used.
h. Inspect (QA).
i. Install ammunition storage magazine IAW TM 9--1090--208--231--1, paragraph 4--7--72, and the
IETM (Armament System Area Weapon System -- Ammunition Handling System Installation -- Magazine
Area Installation -- Ammunition Magazine Assembly -- Magazine -- Ammunition Storage -- Remove and
Install).
j.
Remove sling and reinstall the ADS/deterioration unit IAW TM 1--1520--238--23 or the IETM.
NOTE
To eliminate the recurring inspection requirement, final replacement
hardware must meet all TM and IETM inspection criteria, to include the 50
inch pound drag torque.
k. All hardware other than bolts HS4243V12H34/62 or HS4243--12H34/62 and nut HS5813--12 will
be replaced NLT 2 August 2003. If other hardware has been reinstalled, make the following entry on the
6
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