SECTION,I
NORMAL PROCEDURf,S
PIPER AIRCRAFT
CORPORATION
PA.2&181,
ARCHf,R
II
Use
of
the
mixture control in cruising flighl reduces
luel
consumption
significantly, especialiy at hisher
altitudes. The mixture
should be leaned
during cruising
operation
above
5000 ft. altitude
and ar
pilot\
discretion
al
loweraltitudeswhenT5%powerorlessisbeingused.
Uanydoubt€xistsasto
the amount of
power
being us€d.
the mixture should
be in the full RICH
position
for
all operations under 5000 feet.
To lean
the mixture, disengaSe the lock
and
pull
the mixture
conrrol
until the
engine
becomes
rough, indicating
that
the
l€an mixture
limir has
been
reached
in the leaner cllinders. Then enrich
rhe mix(u'e
b!
pu:hina
the
control tosard\ rhe rnctrumenr panel
unril engine
operario; becornes
lf the airplane is equipped with
rhe oprional exhaust gas
remperarure
(EGn
gauge.
a more accurare means or leanina
i' availdble ro
lhe
pilor.
Be,t
economy mrxrure i\ oblained
by moting the mr\lure
control afl ünrrl
peaI
LC I !i reached. Berr
power
mrxlure is obrained
by
leanrng
ro
peak
FcTand
then €niich€ning
until
the
EGT is 100'F. rich
ofthe
p€ak
value.
Under some
conditions
of altitud€ and throule
posirion,
thi engine may
exhibit
roughn€ss
before
peak
EGT is reached.
If this occurs, rhe
EGT
co-rresponding
to lhe onset
of
engine roughness
should be us€d
as the
peak
Always remember that
the electric fuel
punp
should be rürned
ON
before switchingranks, and should beleftonforashorlperiodthereafter.
In
order to keep the airplane in besr lateral
trim during cruising
fligh! the fuel
should be used altemat€ly from eachtank.
lt is recommended
rhal onetank
be used for one hour after takeoff, thenrhe
orherrank
beus€dfortwohours:
then rerurn ro rhe firrl tank.
$hich
\aillbaveappro\rmälel)
oneand one hali
hours
of fuel remaining ifthe tanks were
full at takeoff. The second
tank will
coniain approximately one half hour offuel.
Do nor run lanks
complet€ly
dry rn flrghr.
The
elec rc fuel pump,hould
be normally
OFI
\orhär
an!
malfunction
of lhe engine dri!en iuelpump
is immediatel) dpparenr
lr
sign,
snouro occur
al dny ume dulng rghl, ruet
exhaustlon
should be suspe€led, at which time
lhe fuel selector should
be
immediately
positioned
to lhe other
tank
and lhe elecrric fuel pump
swirched to the
ON
4.29 Df,SCENT
NORMAL
To
achieve lhe
performance
on Figure
5-29
the power
ondescenr musr
be used.
The throttle
should be set
for 2500 RPM. mixlure
full rich and
maintain an airspeed of 122 KIAS.
ln
cas€
carburetor ice
is encounrered
apply full
carbureror
heat.
REPORT:
YB-1120
+1E
ISSUED: JULY 2, 1979
REVISEDT JULY 5,
l9ts
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