PS Magazine - MAY 1986
PS, The Preventative Maintenance Monthly
ISSUE 402
MAY 1986
The general rule on torquing and
retorquing is to back ofF the Fastener
beFore tightening with a torque
wrench.
But every rule has exceptions. One
exception to the torque/ retorque rule
is the UH-I taiL rotor retaining nut.
When you retorque that nut be-
38
t<
•
:±1
-
²
L-±
²
³´
.
•
'
±
I
,_
_
±²
-±
.
±F you have to replace an air FiLter haLF, remember that the old and new
j
•
²³c:
F²lter haLves don't mix.
´
1
.
'
tween 5-10 hours oF Flight aFter
instalLing the tail rotor, you do
not
back of³ the nut First.
´ike the Note on Page 5-119 oF
TM 55-1520-210-23-1 says, you reµ
torque ¶y turning in the tightening
direction onLy. The idea is to correct
any torque Loss that may have
occurred as a result oF split cone
seating.
±n this particuLar case, iF you ¶acKed
of³ the nut ¶eFore retorquing, yo·¸d
set ·p a new torque situation t¹at
wºuld have to ¶e veriFied again and
again.
But this is a special sit·ation.
»nLess your ¼M says otherwise, you
bacK oFF on the Fastener ¶eFore
retightening with a t½rque wrench.
MAY86
µ
¾ig 107 oF TM 55-1520¿210-23P-I gives NSN 2945À00-442-2539 For the
lower halF and 2945-00-442-2544 For the upper.
Those are the newÀstyLe FiLter halves. The parts manual says they repLace
the oLder modelsÁ NSNÂs 2945-00Ã917-7073 and -7074.
New
style
fiLter
UH-1 .±.
But the oLd and new types donÂt
work together. So iF you stilL have
the old kind, stay with them untiL
stocks are exhausted." Then ask For
the others.
OF course, you wonÂt order ¶oth
haLvesÄold or newÅiF you only need
to repLace one part.
Ground Handling Won't DIsturb Fuel
Dear Half-Mast,
Para
2¶·¸
of TM
55¶¹520¶2¹0¶¹0
says to let the fuel In our
Hueys settle after rEfueLng before taking preF±ght fUel sam²
ples. ³s there any need to let the fuel set´e for a while after
groundhandling the aircraft before we take a fuel sample?
BºR»L¼
±
Dear
b½ r¾l¿,
!
No. The amOunt ±fUE/ agi1atIO² Resul³i²GoM m´vI²µ a² aI¶c¶
AF·
²
·
on
¸he ¹º»u¼d ½s ¾O¸ ¿²OugH to aÀÁeCtÂÃel sampLIJÅÆ
l-Jdf
MAY86
39
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