ASE - Drive Train System
What is the primary purpose of the drive system? - ANS-The primary purpose of the
drive system is to transmit torque from the engines to the proprotors
what are the secondary purposes of the drive system? (2) - ANS-1. Synchronize the
Proprotors
2. Provide the capability for SE operation
What are the primary components of the drive system? (5) - ANS-1. 2 Prop Boxes
2. 2 TAG Boxes
3. Mid Wing Gearbox
4. Emergency Lube System
5. Interconnecting shaft system
What micron filters are on each gearbox? - ANS-There is a 3 micron and a 40 micron
filter on each gearbox
How is impending bypass of the filtering system displayed? - ANS-It is displayed on the
Maintenance Flight Summary and a switch on the filter will extend
At what pressure does the system display impending bypass? - ANS-35-39 psi
At what pressure will the system actually bypass the filter assembly? - ANS-40 psi
What monitors and provides power for the burn type debris sensors? - ANS-The DSIU
Which components have burn type debris sensors? - ANS-All the gearboxes have burn
type debris sensors
Will anything alert the crew that a chip detector is burning debris? - ANS-Yes, an
advisory will post on the CDU
(L TAGB CHIP BURN)
When will the the CDU post a chip caution? - ANS-After three burn attempts, if the
debris sensor still detects chips, it will display the following caution:
L TAGB CHIPS
, What provides the forward mount for each engine? - ANS-The lower aft portion of the
PRGB
What is located at the first stage input gear of the PRGB? - ANS-An overrunning clutch
What does the overunning clutch in the PRGB allow? - ANS-1. SE Operation
2. Autorotation
3. Re-matching of unmatched engine speeds
What allows for counterclockwise rotation of the left proprotor? - ANS-An extra idler
gear in the left PRGB
What is the rotation reduction provided by the PRGB? - ANS-Reduces RPM's from
15,000 at engine input to 397 (100% Nr)
What protects the PRGB oil system from over pressurizing? - ANS-A pressure
regulating bypass valve returns excess oil back to the inlet side of the pump
How many burn type chip detectors are on the PRGB? - ANS-3
What provides cooling for PRGB oil? - ANS-The nacelle heat exchanger
At what temperature will PRGB oil bypass the nacelle heat exchanger? - ANS-At 82° a
thermostatic valve begins bypassing oil from the nacelle heat exchanger
What monitors PRGB oil pressure? - ANS-Two Transducers
Primary is located on the oil filter manifold
Secondary is located on the input quill housing
What monitors the PRGB oil temperature? - ANS-A temperature transducer mounted on
the input quill housing
Where are PRGB oil pressure and temperature readings sent? - ANS-To the respective
NIU's. The NIU's report the info to the MC's for display in the cockpit in the form of
gauges and WCA's
When does the ELS activate and deactivate? - ANS-The ELS activates when PRGB oil
pressure drops below 30 psi and deactivates when PRGB oil pressure rises above 35
psi
What is the primary purpose of the drive system? - ANS-The primary purpose of the
drive system is to transmit torque from the engines to the proprotors
what are the secondary purposes of the drive system? (2) - ANS-1. Synchronize the
Proprotors
2. Provide the capability for SE operation
What are the primary components of the drive system? (5) - ANS-1. 2 Prop Boxes
2. 2 TAG Boxes
3. Mid Wing Gearbox
4. Emergency Lube System
5. Interconnecting shaft system
What micron filters are on each gearbox? - ANS-There is a 3 micron and a 40 micron
filter on each gearbox
How is impending bypass of the filtering system displayed? - ANS-It is displayed on the
Maintenance Flight Summary and a switch on the filter will extend
At what pressure does the system display impending bypass? - ANS-35-39 psi
At what pressure will the system actually bypass the filter assembly? - ANS-40 psi
What monitors and provides power for the burn type debris sensors? - ANS-The DSIU
Which components have burn type debris sensors? - ANS-All the gearboxes have burn
type debris sensors
Will anything alert the crew that a chip detector is burning debris? - ANS-Yes, an
advisory will post on the CDU
(L TAGB CHIP BURN)
When will the the CDU post a chip caution? - ANS-After three burn attempts, if the
debris sensor still detects chips, it will display the following caution:
L TAGB CHIPS
, What provides the forward mount for each engine? - ANS-The lower aft portion of the
PRGB
What is located at the first stage input gear of the PRGB? - ANS-An overrunning clutch
What does the overunning clutch in the PRGB allow? - ANS-1. SE Operation
2. Autorotation
3. Re-matching of unmatched engine speeds
What allows for counterclockwise rotation of the left proprotor? - ANS-An extra idler
gear in the left PRGB
What is the rotation reduction provided by the PRGB? - ANS-Reduces RPM's from
15,000 at engine input to 397 (100% Nr)
What protects the PRGB oil system from over pressurizing? - ANS-A pressure
regulating bypass valve returns excess oil back to the inlet side of the pump
How many burn type chip detectors are on the PRGB? - ANS-3
What provides cooling for PRGB oil? - ANS-The nacelle heat exchanger
At what temperature will PRGB oil bypass the nacelle heat exchanger? - ANS-At 82° a
thermostatic valve begins bypassing oil from the nacelle heat exchanger
What monitors PRGB oil pressure? - ANS-Two Transducers
Primary is located on the oil filter manifold
Secondary is located on the input quill housing
What monitors the PRGB oil temperature? - ANS-A temperature transducer mounted on
the input quill housing
Where are PRGB oil pressure and temperature readings sent? - ANS-To the respective
NIU's. The NIU's report the info to the MC's for display in the cockpit in the form of
gauges and WCA's
When does the ELS activate and deactivate? - ANS-The ELS activates when PRGB oil
pressure drops below 30 psi and deactivates when PRGB oil pressure rises above 35
psi
