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hot start.
a When attempting a crossbleed or normal
ground start, do not attempt to reengage
the ENG CRANK switch if the engine is
spooling down and ‘pm is greater than 46
percent. At rpm’s of 30- to 46-percent
rpm, the ENG CRANK switch may not
stay engaged because of normal variations
in starter cutout speed.
a The ENG CRANK switch should automatically
disengage between 49- to approximately
51-percent rpm during a
crossbleed or normal ground start.
2.9.4 Airstarts. AFTC logic provides main highenergy
ignition automatically during automatic and
manual spooldown, crossbleed, and windmill airstarts.
Selecting the BACKUP IGNITION switch to ONprovides
continuous backup ignition to both engines, and
backs up main high-energy ignition during manual
spooldown, crossbleed, and windmill airstarts.
2.10 ENGINE OIL SYSTEM
Each engine has a self-contained, dry sump nonpressurere
gulatedo il systemt hat providesf iltered oil for
lubricating and cooling engine main shall bearing, oil
seals,g earboxes,a ccessories,a nd provides a hydraulic
medium to operate the engine exhaust nozzles (FO-5).
A storage tank feeds oil to an oil pump that supplies
oil under pressure to the forward sump in the engine
front hub, the mid sump in the fan hub, the aft sump in
the turbine hub, and the inlet and accessory gearboxes.
Oil is recoveredt hrough scavengingf rom the sumpsa nd
accessoryg earboxes,p umped past a chip detector,a nd
cooled in a fueVoil heat exchanger before returning to
the storage tank.
A separatec ompartment in the storaget ank provides
oil to the exhaust nozzle hydraulic system. Oil returning
from the nozzle to the tank provides auxiliary oil supply
to the No. 3 bearing when normal supply is interrupted
or during engine spooldown.
The oil system permits engine operation under all
flight conditions. During zero- or negative-g flight, oil
pressure may decrease to zero but will return to normal
when positive-g flight is resumed. Normal oil consumption
is 0.03 gallon per operating hour with the maximum
being 0.1 gallon per operating hour. Capacity of the oil
storage tank is 3.7 gallons, with 2.9 gallons usable. A
sight gauge on the side of the storage tank indicates
down to a 2-quart-low oil level. The protrusion of a
bypass indicator underneath the oil scavenge pump indicates
a clogged filter element.
ORIGINAL 2-34
Note
l Engine oil level must be checked within
30 minutes ofengine shutdown, otherwise
nm enginea t SO-percenrtp m or greaterf or
10 minutes to ensure proper servicing.
l A failed-open nozzle may indicate an oil
leak; however, if the leak is in the nozzle
hydraulic circuit, only that portion of the
main engine lube oil will be lost.
2.10.1 Oil Cooling. Filtered and scavenged oil is
cooled by a fuel/oil heat exchanger.T his oil is thenu sed
in a heat exchanger to cool the exhaust nozzle oil. A
cold-oil bypass valve opens when the heat exchanger
pressure differential is 44 psi, because of reduced oil
temperatureo r exchangerb lockage, allowing oil flow to
bypass the heat exchanger (for example, during cold
engine starts).
2.10.2 Oil Pressure Indicators. An oil pressure
transmitter in each engine’s oil supply line provides a
continuous signal to the oil pressure indicator. Another,
independento il pressures witch in each oil supply line
activates the OIL PRESS light when either engine’s oil
pressured ecreasesto 11 psi. The oil pressures witches
and lights receive electrical power from the essentialNo.
2 acb us.T he OIL PRESSl ight and oil pressurein dicator
are independenot f eacho ther.
Note
l During cold starts, oil pressure may exceed
6.5 psi. The 65 psi oil pressure limit
should not be exceeded for more than 1
minute.
l Maneuvers that result in zero or negative
g’s on the engine (such as rapid rolls,
pushovers, or bugout maneuvers) may
cause oil pressure fluctuations and momentary
illumination of the low oilpressure
light.
2.10.3 OIL HOT Caution Lights. The L or R OIL
HOT caution light may be illuminated by either high
engine oil temperature or by high forward-engine gearbox
scavengeo il temperature.T he caution lights illuminate
when respective engine oil temperature exceeds
300 “F during a temperature increase and go out at
280 “F minimum during a temperatured ecrease.T he
caution lights also illuminate when respective fonvard
engine gearbox scavenge temperature exceeds 375 “F
during a temperature increase, and go out at 345 “F
　
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