Drive System Flashcards

Question

Engine/C Box Debris Screen

Answer 1

Located in each ENGINE transmission SCAVENGE return line Bolted to inlet return of respective scavenge pump, when metal particles get trapped by screens they activate SCREEN ENG XMSN LEFT/RIGHT magnetic indicator on mx panel and simultaneously light ENG 1/2 CHIP DET light

Answer 2

One scavenge pump for each gearbox lube system, driven by same shaft as pressure pumps, and return oil back to respective section of 3 compartment reservoir

Answer 3

Independent from main lube system provided for each engine and c box transmission, is running anytime the primary system is functioning. It has its own pump, filter, pump relief valve, low pressure switch, and lube jets Both primary and aux lube systems designed to pump return oil into aux sump. The sumps are located within each of 3 main sumps in reservoir. Oil fills aux sump first and then overflows into main sump Aux lube system provides essential lubrication fro critical bearings and gears for up to TWO HOURS Aux oil does NOT flow through the oil coolers and there is no provision for cooling oil

Answer 4

3 separate pumps, mounted on forward side of c box, driven by common shaft in c box Each pump draws oil from respective aux sump

Answer 5

Operates when system pressure falls below 10 psi, causes shared XMSN AUX PRESS light to come on and respective aux lube pressure magnetic indicator on mx panel Mx panel must be consulted to determine which aux system is at fault

Answer 6

Gearbox built with forward rotor shaft INCLINED at 9 degree angle, internally has spiral bevel pinion gear, ring gear, and 2 stages of planetary gears Accessory drive gears in transmission drive main and aux oil pump and main rotor tach. Main oil pump is fitted to forward underside of gearbox and is accessible externally. It draws oil from sump, pressurizes it, and passes oil to oil cooler in aft pylon area and onto main bear surfaces and gears of forward transmission Aux pump is within forward transmission housing, forward of rotor head shaft. Main rotor tach is attached to outer face of main oil pump, consists of small 3 phase AC generator, frequency of AC current is measured and represented as rotor speed percent Chip detector in aux sump of gearbox illuminate XMSN CHIP DET and must be identified by transmission mx panel

Answer 7

Comprised of: 1. Wet type sump 2. Main pump protective screen 3. Pressure pump 4. Pump relief valve 5. Filter 6. Oil cooler Oil from sump goes through screen and into inlet of pump, pump pushes oil through filter, oil cooler, and jet protection screen to transmission inlet Oil then goes to lubricators and jets within transmission, spraying oil on transmission bearing and rotating gears

Answer 8

Wet sump at base of gearbox, integral funnel shaped casting in center of base forms aux system sump to which all oil is returned Oil is directed to aux sump, which fills first, then overflows to main sump area 16 us quarts

Answer 9

Mounted on forward bottom side of transmission casing, pump is driven by accessory drive shaft also driving rotor tach

Answer 10

Lowest radiator cooler on aft pylon is for forward transmission When oil temp is above approx 70*C a bypass valve closes and directs oil through the cooler Bypass valve also acts as a safety relief should cooler becomes blocked

Answer 11

Fitted to RH side of each rotor gearbox, converts oil pressure to electric signals to power instrumentation in cockpit Power supply is 115VAC and CB is on No. 2 PDP

Answer 12

Fitted downstream of each pressure transducer, causes XMSN OIL PRESS light to come on at 18psi with diminishing pressure CB is on No. 2 PDP

Answer 13

Fitted to aux sump of forward transmission, illuminates XMSN CHIP DET and simultaneously triggers magnetic indicator on transmission mx panel in ramp area Power supply is 28vdc from emergency bus system and CB is No. 1 PDP

Answer 14

Aux lube system provides lube to limited section of gearbox and is complete and separate system from main lube system Contained entirely within the forward transmission housing Consist of: 1. Aux sump 2. Sump screen 3. Aux pump 4. Filter 5. Low oil pressure switch Oil is totally self contained and not allowed to flow to the oil cooler

Answer 15

Pump is driven by internal gear trains and independent of main oil drive Pump draws oil from aux sump and pressurizes it to 1.25gpm at 80psig Pressure relief valve opens at 90psig

Answer 16

Located externally on left side of lower transmission housing, filters oil from aux pump to lube jets

Answer 17

Located beside aux oil filter on left lower side of transmission housing Illuminates XMSN AUX PRESS if pressure falls below 10psi, will also simultaneously operate magnetic indicator on mx panel

Answer 18

Transmits torque from aft synch shaft to aft vert drive shaft, rotor shaft is tilted forward 4*, consists of spiral bevel gear, ring gear, and 2 stage of planetary gears for reduction Contains 2 accessory drive gears: 1. First one driven by input shaft and drives oil cooler blower shaft and oil scavenge pump. Blower shaft provides drive for oil cooler fan and via an accessory pad, the backup flight control hydraulic pump and emergency generator 2. Second accessory gear drives AGB section with a sprag clutch. AGB drives lube pump, 2 flight control hydraulic pumps, 2 AC generators, utility hydraulic pump, 2 generator scavenge pumps, and AGB motor Transmission has main and aux system: 1. Main system is is pressure system with wet sump, temp bulb, chip detector, pump protection screen, drain valve, pressure switch. Main system also lubes thrust gear on aft vert shaft. Thrust bearing return oil return line contains chip detector and oil filter 2. Aux system consists of integral pump, pump protection screen, filter, and pressure switch.

Answer 19

Consists of: 1. Wet type sump 2. Pump protection screen 3. Pressure pump 4. Relief valve 5. Filter 6. Oil cooler Oil is drawn from sump through protection screen and into inlet of pump. Pump pressurizes system and oil goes through filter, cooler, and strainer to transmission inlet port. Oil supplied through external piping goes to aft vert shaft thrust bearing. Passages in transmission deliver oil to lubricators and jets, which spray oil onto gears and bearings Pressurized oil also lubricates accessory drives at rear of transmission. External pressure line provides oil to the oil cooled generators, and scavenge pump returns oil to sump. Flexible tube at bottom of accessory drive case allows oil from accessory gears and bearing to drain into sump Scavenge pump in fan drive housing is driven by fan drive shaft, pump returns oil, which collects in forward part of transmission during nose low attitudes, to main sump Mains sump holds 22.5 us quarts. Components on sump include: 1. Oil temp bulb on forward sump wall 2. Chip detector on bottom of aux sump 3. Magnetic plug 4. Drain valve at aft end of sump

Answer 20

Aft drive shaft secured to aft transmission deck by cast housing and thrust bearing. Thrust bearing is lubricated with oil from main lube line Return oil passes filter and chip detector, which activates SHAFT magnetic indicator on mx panel and XMSN CHIP DET on master caution panel *If aft transmission lube system fails, thrust bearing would NOT be lubricated*

Answer 21

Identical to forward transmission aux lube system

Answer 22

Installed to prevent minute metallic particles from activating warning system Operates automatically and consists of zapper module (located at right side of aircraft) and 8 chip detectors Module contains capacitors, circuitry, and electro mechanical four digit counter for each chip detector When particles build up and bridge magnetic contacts of chip detector, capacitor is discharged to burn off particles and counter is advanced one digit Larger particles cannot be burned off and will activate chip detector and indicators. Switch is provided to disable the system. When disabled, warning light located on zapper module will come on indicating system is inop and annoying chip detector indications could result