Systems Flashcards
What wil Happen if the helicopter is shut down with one of its tail rotor cables disconnected?
The other will disconnect as well, leaving the blades in a fixed pitch
What is the cant of the Tail rotor and how much lift does it provide?
20deg
2.5%
Functions of the HMU
PMCANVDTO
Pumps fuel at a high pressure
Meters fuel to the ODV
Collective pitch compensation
Accel/deccel limiting (comp stalls/flameout)
Ng limiting
Variable Geometry
DEC/EDECU lockout over ride
Torque motor to trim NG
Opens Vapor Vent
What is significant about the outer loop?
The outer loop is controlled by the #2 FCC and controls trim. Has 100% Authority of the flight controls at the rate of 10% per second
How is DC power Obtained?
Batteries
DC Converters (2)
What Axes Have boost?
Collective, Pitch, Yaw
Hot Start Prevention
Will Abort start @900C as long as NG<60, NP<50
What are the minimum Parking Requirements
Gust Lock/Rotor Brake
Parking Brake
Tailwheel Locked
Wheels Chalked
Which axes have trim?
Collective
Pitch
Roll
Yaw
Functions of the ODV
HOPS
Hot start prevention
Overspeed prevention
Purges fuel
Sequences Fuel (PFHLO)
3 Windings of the Alternator
NID
NG signal to the cockpit
Ignition power to the exciters
Dec power
How much PSI does the pitch trim servo require?
1000PSI
How long can you fly with a GEN BRG caution?
up to 10 HRS
What does a T/R Quad Caution indicate?
One/both of the T/R cables have failed
Functions not available in lockout
TGT Limiting
Isochronus NP governing
Np reference (INCR/DECR)
Torque matching/load sharing
What Computes Heading, Altitude, Turn Rate
EGI
What does HYD pump 2 supply?
Pilot assist module, Primary Servo 2
How much pressure does the HYD system supply?
3000PSI
When do Engine Anti-Ice advisories appear?
Engine Anti-Ice on
Low power settings
Electrical failure
What Busses are powered with only the battery switches on?
Battery Bus
Battery Utility Bus
DC Essential Bus
When does the APU ACCUM LOW advisory appear?
<2600PSI
When can heading be coupled on the FDDCP?
> 50KIAS
When does the impending bypass pop on the pilot assist module?
1375PSI
What must be on for FPS to work
SAS, Boost, Trim
What does SAS provide? What axes?
SAS Provides dynamic stability with short term rate dampening
Pitch, Roll, Yaw
What does the backup pump supply?
Everything
APU Accumulator
#2 T/R Servo
What happens if there is a leak in the APU accumulator?
if it is >1.5GPM a velocity fuse will close the line
What should you do if the APU fails?
Check BITE codes
What type of rotor systems are on the UH-60?
Main- Fully Articulated (Lead, Lag, Flap, Feather)
Tail- Rigid
How can vertical speed be coupled?
> 50KIAS, 0-2000FPM
What does HYD pump 1 supply?
Primary servo 1
T/R servo 1
Why cant both stages of the primary servo’s be isolated at the same time?
Electrical interlock
What type of bearings are used in the main rotor system?
Elastomeric Bearings
When must inlet anti-Ice come on?
<4deg C- MUST
4-13 - MAY
>13 - WILL NOT
Radio Locations
1 ARC 201 - Under Co-pilot Seat
#2 ARC 231-Nose
#3 ARC 231-Aft Avionics bay
#4 ARC 201- Aft Avionics bay
When will a RSVR LOW caution appear?
60% of fluid remaining
How are the HYD pumps driven?
1&2 - Accessory Modules
Backup- AC Motor
What does Go-Around mode provide?
750 fpm clim @ 70KIAS
What Switch is located on the #1 Accessory Module?
Oil Pressure- will illuminate @ 14PSI +/- 2
Where can you not extenguish a fire if you have no A/C power?
2 Engine bay
What Will cause you to switch from a 10min TGT limit to 2.5 min with an EDECU?
3% difference in NP VS reference
<96%NP
>5% per second NP drop
Below 50% Q
Engine out
Equiptment avialible w/ battery power only
basically everything on #2 side
When can airspeed be coupled on the FDDCP?
50-150 KIAS
What sensor is located on the #2 Accesory module?
NR
How many fire detectors are on the aircraft?
5
When will inlet anti-ice advisories appear?
93degC in inlet
What is significant about the inner loop?
The inner loop is controlled by both FCC’s, controls the SAS and only has 10% authority of the controls
Functions of the MMU
Collective to pitch
Counteracts downwash on the stabilator
Collective to roll
Counteracts translating tendency
Collective to yaw
Counteracts anti-torque
Yaw to Pitch
Counteracts the lift of the tail rotor
Collective to airspeed to yaw
Decreases as airspeed increases (0-40 Max, 40-100 decreases, >100 no mixing)
What 5 lights turn on the backup pump?
HYD Pump 1 LOW
HYD Pump 1 Fail
T/R Servo 1 Fail
HYD pump 2 Fail
APU Accumulator low
Where does the APU get its Fuel from
1 Fuel cell
What system processes airspeed and Altitude?
ADC’s
Functions of the DEC
INFLTHHOT
Isochronus NP governing(keeps NP@ Reference)
NP reference(INCR/DECR)
Fault codes
Load sharing/Q matching
TGT limiting
Hot start prevention
History counter
Overspeed prevention
Transient droop compensation
How long is emergency power applied?
15 mins day
12 mins night
How many filters are on each pump? When do the Bypasses pop?
2- Pressure and return
70+/- 10 PSI over normal
How many bleed ports are on the engine?
3- Anti-ice start bleed valve & Pneumatic system
What does FPS provide? In which axes?
FPS provides basic autopilot when coupled with trim
<50KIAS Heading hold
>50KIAS Heading hold & Turn
Coordination
Pitch
Roll
Yaw
How much is MTA reduced with engine anti-ice on?
20% off the top
What is the “Muscle” for trim
Electromechanical actuators
Collective
Roll
Yaw
Hydroelectromechanical actuator
Pitch
What happens if both T/R cables fail?
The tail rotor becomes fixed pitch @ 10.5deg
What are the 5 transmission modules?
Main Transmission
2 input modules
2 accessory modules
What is attached to the accesory modules?
HYD Pump
Main Generator
How are the main generators cooled?
Transmission oil
What fire extenguisher must be used if there is no AC power?
Reserve
When must a fuel sample be done?
First flight of the day
4 hrs after refuel
Suspected contamination
How long does it take the backup pump to turn on?
3-5 sec with APU generator
.5 sec with main generator
What are the 5 subsystems of AFCS
SAS
Trim
FPS
Stabilator
Coupled flight director
What limitations are there if the APU is the only source of AC power?
The backup pump and windshield de-ice can not be on at the same time
How much is MTA decreased if the heater is on?
5% , 7.5% with aux heater
What type of current is the primary source of power?
AC
What are the 4 sections of the engine?
Hot, Cold, Power turbine(NP), Accessory
What controls the trim?
FCC #2
What does ILS decel provide?
Deceleration on course/glideslope to 70KIAS @200’
When can RALT be coupled?
0-1500’AGL
When does TGT limiting not work?
Lockout
Compressor stalls
Engine starts
Purpose of the Stabilator?
Provide static and dynamic stability in the pitch axis.
SCALP
Streamlines rotor downwash
Collective coupling
Angle of incidence
Lateral sideslip
Pitch rate feedback
Methods of refuel
Pressure
359gal, 300gpm @55PSI
Closed Circuit
357gal, 110gpm@15PSI
Gravity
360gal
Radio antenna locations
1 Whip on tail pylon
#2 bottom of tail
#3 top next to satcom
#4 tail pylon
What are the 3 functions of trim?
Force Gradient
Muscle for trim
Electronic coupling
