HYDRAULICS Instructor: CW2 Scott Paul Rogers
HYDRAULICS
Instructor:
CW2 Scott Paul Rogers
OUTLINETerminal Learning Objective
Hydraulic Systems
Component and Location
Description
Leak in No. 1 HYD System
Leak in No. 2 HYD System
Review
Questions
TERMINAL LEARNING OBJECTIVE:To develop the student’s understanding of the components and functions of the Hydraulic System.
HYDRAULIC SYSTEMS
Provides 3000 to 3100 + 50 psi
Operates–Primary Servos
–Tail Rotor Servos
–Pilot Assist Servos
–APU Start motor
COMPONENTS AND LOCATION
3 Hydraulic Pump Modules
2 Transfer Modules
Utility Module
Pilot Assist Module
3 Primary Servos
MAJOR COMPONENTS
COMPONENTS AND LOCATIONMAJOR COMPONENTS (cont)
Tail Rotor Servo
4 Pilot Assist Servos
APU Accumulator
APU Handpump
Refill Handpump
System Description
Three Hydraulic Systems
–No. 1 Hydraulic System
–No. 2 Hydraulic System
–Backup Hydraulic System
#1 PRISERVO PRESS
ps
ps
ps
T.V.
#1 TAIL RTRSERVO
(not pressurized)
1st StagePrimaryServo
1st StagePrimaryServo
1st StagePrimaryServo
#1 Transfer Module
#1 Hydraulic PumpModule
#1 RSVRLOW
#1 HYDPUMP
L
A
F
TAIL SERVONORMAL
BACKUP
SVO OFF1ST STAGE
2ND STG
*
*
*
HydQty
UH-60 #1 HYDRAULIC SYSTEM
LDI
HYDlogic
Backup hydraulic pump
60% remaining
Pops @ 70 psid
Pops @ 70 psid(bypasses @ 100 psid)
ps
ver 1.09/97
Yaw Boost Servo
Pitch Boost Servo
Pitch TrimActuator
Collective BoostServo
PilotAssistModule
S
BOOSTSERVO OFF
#2 PRISERVO PRESS
ps
ps
ps
#2 Hydraulic PumpModule
T.V.
2nd StagePrimaryServo
2nd StagePrimary.Servo
T
B
2nd StagePrimary.Servo
#2 Transfer Module
#2 RSVRLOW
#2 HYDPUMP
ps
SAS OFF
L
A
F
Yaw
Roll
Pitch
*
pr
(1,000 psi)
FLT PATHSTAB
TRIM FAILSAS 2 / FPSComputer
BOOST
ON
HydQty
SAS 1
ON
SAS 2
ON
SAS Actuators
TRIM
ON
UH-60 #2 HYDRAULIC SYSTEM
SVO OFF1ST STAGE
2ND STG
LDI
Pops @ 1375 psi
Backup hydraulic pumpps
ps
ps
ver 1.09/97
Utility Module
ps
BACK-UPPUMP ON
BACK-UPRSVR LOW
APU ACCUMLOW
psT.V.
V.F.
psT.V.
2nd Stage T/Rshutoff valve
#2 TAIL RTRSERVO
(pressurized)
ps
APU HydraulicStart Motor
#2 Transfer Module
TAIL SERVONORMAL
BACKUP
BACKUPHYD PUMP
OFF
ON
AUTO
Back-Up Pump
#1 RSVRLOW
#1 HYDPUMP
#1 TAIL RTRSERVO
#2 HYDPUMP
APU ACCUMLOW
*5 lights that activate the Back-Up Pump ( back-up hyd. pump switch & WOW switch position affects activation.)
*
All 5 (when In flight)
(Also activates pump on ground with switch off)
to APU accum.
3000
PSI
1st stage primary servo's
#1 tail rotorservo
2nd stage primary servo's
pilot assist area
UH-60 BACKUP HYDRAULIC SYSTEM
#1 Transfer Module
1.0 gpmnormal
1.5 gpmcloses
Depressurizes to 700 psi for:.5 sec--main generator,
3-5 sec--APU or External power
Cuts power @ 160 deg.(disabled in AIR)
ver 1.09/97
Yaw Boost Servo
Pitch Boost Servo
Pitch TrimActuator
Collective BoostServo
PilotAssistModule
S
ps
Utility Module
ps
BACK-UPPUMP ON
BACK-UPRSVR LOW
BOOSTSERVO OFF
#1 PRISERVO PRESS
#2 PRISERVO PRESS
ps
ps
ps
ps
ps
ps
APU ACCUMLOW
ps
#2 Hydraulic PumpModule
T.V.
2nd StagePrimaryServo
2nd StagePrimary.Servo
T
B
psT.V.
2nd Stage T/Rshutoff valve
#2 TAIL RTRSERVO
#1 TAIL RTRSERVO
(pressurized) (not pressurized)
ps
1st StagePrimaryServo
1st StagePrimaryServo
2nd StagePrimary.Servo
1st StagePrimaryServo
APU HydraulicStart Motor
#1 Transfer Module
#1 Hydraulic PumpModule
#2 Transfer Module
#2 RSVRLOW
#2 HYDPUMP
#1 RSVRLOW
#1 HYDPUMP
ps
ps
SAS OFF
L
A
F
TAIL SERVONORMAL
BACKUP
BACKUPHYD PUMP
OFF
ON
AUTO
SVO OFF1ST STAGE
2ND STG
Back-Up Pump
#1 RSVRLOW
#1 HYDPUMP
#1 TAIL RTRSERVO
#2 HYDPUMP
APU ACCUMLOW
*5 lights that activate the Back-Up Pump ( back-up hyd. pump switch and WOW switch position affects activation.)
Yaw
Roll
Pitch
LDI
UH-60 HYDRAULIC SYSTEMS OPERATIONAL BLOCK DIAGRAM
*
*
*
*
*
pr
(1,000 psi)
FLT PATHSTAB
TRIM FAILSAS 2 / FPSComputer
BOOST
ON
(return lines omitted for clarity)
HydQty
All 5 (when In flight)
(Also activates pump on ground with switch off)
SAS 1
ON
SAS 2
ON
SAS Actuators
UH-60 HYDRAULICS SYSTEM LEAK ISOLATION
L.D.I.--Isolates leaks in the #1 T/R servo & Pilot Assist area.T.V.--Isolates a leaking Hydraulic Pump.PILOT--Isolates leaks in primary servos.
LDI
to APU accum.
TRIM
ON
3000
PSI
(ver 1.01)
HydQty
Leak in #1 HYD System
LEAKAGE IN NO. 1
Partial Loss ofNO. 1 Resv Hyd Fluid
Activation of NO. 1Resv Level Sensing Switch
#1 RSVRLOW
Turns off NO. 1Tail Rotor Servo
#1 TAIL RTRSERVO
BU Pump On BACK-UPPUMP ON
Turns On NO. 2Tail RTR Servo
# 2 TAIL RTRSERVO ON
Logic module shuts the NO. 1 TR shutoff valveat the NO. 1 Transfer Module and opens the NO. 2 T/R shutoffvalve.
If No Other Lights
Leak is in NO. 1 Stage Tail Rotor Servo
# 1 PRISERVO PRESS
TAIL ROTORQUADRANT
MAIN XMSNOIL TEMP
BOOST SERVOOFF
LFT PITOTHEAT
CHIP INPUTMDL - LH
CHIP ACCESSMDL - LH
MR DE-ICEFAIL
MAIN XMSNOIL PRESS
#1 ENGANTI-ICE ON
APU ON
APU ACCUMLOW
# 2 PRISERVO PRESS
# 1 TAIL RTRSERVO
APU OILTEMP HI
TRIM FAIL
RT PITOTHEAT
CHIP INPUTMDL - RH
CHIP ACCESSMDL - RH
ICEDETECTED
BACK-UPRSVR LOW
#2 ENGANTI-ICE ON
BACK-UPPUMP ON
#2 TAIL RTRSERVO ON
#1 HYDPUMP
IRCMINOP
INT XMSNOIL TEMP
STABILATOR
FLT PATHSTAB
CHIPINT XMSN
CHIP MAIN MDL SUMP
MR DE-ICEFAULT
#1 RSVRLOW
#1 ENG INLETANTI-ICE ON
APU GEN ON
SEARCH LTON
#2 HYDPUMP
AUX FUEL
TAIL XMSNOIL TEMP
SAS OFF
IFF
CHIPTAIL XMSN
APU FAIL
TR DE-ICEFAIL
#2 RSVRLOW
#2 ENG INLETANTI-ICE ON
PRIME BOOSTPUMP ON
LDG LT ON
If the Leak continues
Leak in #1 HYD System (Cont)
Complete Loss of NO. 1
RSVR HYD fluid #1 HYDPUMP
#1 PRISERVO PRESS
Backup Pump SuppliesNo. 1 PRI SERVO and
NO. 1 TR SERVO (NO. 1 TR Servo Turned Back On)
BACK-UPPUMP ON
Logic module turns off 2nd stage T/R shut off valve, andopens the NO. 1 T/R shutoff valveat the NO. 1 Transfer Module
If No Other Lights
Leakage is up stream of NO. 1 transfer module
# 1 PRISERVO PRESS
TAIL ROTORQUADRANT
MAIN XMSNOIL TEMP
BOOST SERVOOFF
LFT PITOTHEAT
CHIP INPUTMDL - LH
CHIP ACCESSMDL - LH
MR DE-ICEFAIL
MAIN XMSNOIL PRESS
#1 ENGANTI-ICE ON
APU ON
APU ACCUMLOW
# 2 PRISERVO PRESS
# 1 TAIL RTRSERVO
APU OILTEMP HI
TRIM FAIL
RT PITOTHEAT
CHIP INPUTMDL - RH
CHIP ACCESSMDL - RH
ICEDETECTED
BACK-UPRSVR LOW
#2 ENGANTI-ICE ON
BACK-UPPUMP ON
#2 TAIL RTRSERVO ON
#1 HYDPUMP
IRCMINOP
INT XMSNOIL TEMP
STABILATOR
FLT PATHSTAB
CHIPINT XMSN
CHIP MAIN MDL SUMP
MR DE-ICEFAULT
#1 RSVRLOW
#1 ENG INLETANTI-ICE ON
APU GEN ON
SEARCH LTON
#2 HYDPUMP
AUX FUEL
TAIL XMSNOIL TEMP
SAS OFF
IFF
CHIPTAIL XMSN
APU FAIL
TR DE-ICEFAIL
#2 RSVRLOW
#2 ENG INLETANTI-ICE ON
PRIME BOOSTPUMP ON
LDG LT ON
If the Leak continues
Leak in #1 HYD System (cont)
Partial Loss ofBackup Resv Hyd Fluid
Activation of BackupResv Level Sensing Switch
BACK-UPRSVR LOW
Leakage in 1st Stage PRISERVO
NO PILOT ACTION PILOT MOVE SERVOOFF SWITCH1ST STAGE
NO PILOT ACTIONRESULTING CONDITION
Loss of NO. 1 Primary ServoLoss of NO. 1 and NO. 2 T/R ServoBack up Pump Runs Dry
BACK-UPRSVR LOW
#1 PRISERVO PRESS
#1 HYDPUMP
#1 RSVRLOW
#1 TAIL RTRSERVO
BACKUPPUMP INOP
# 1 PRISERVO PRESS
TAIL ROTORQUADRANT
MAIN XMSNOIL TEMP
BOOST SERVOOFF
LFT PITOTHEAT
CHIP INPUTMDL - LH
CHIP ACCESSMDL - LH
MR DE-ICEFAIL
MAIN XMSNOIL PRESS
#1 ENGANTI-ICE ON
APU ON
APU ACCUMLOW
# 2 PRISERVO PRESS
# 1 TAIL RTRSERVO
APU OILTEMP HI
TRIM FAIL
RT PITOTHEAT
CHIP INPUTMDL - RH
CHIP ACCESSMDL - RH
ICEDETECTED
BACK-UPRSVR LOW
#2 ENGANTI-ICE ON
BACK-UPPUMP ON
#2 TAIL RTRSERVO ON
#1 HYDPUMP
IRCMINOP
INT XMSNOIL TEMP
STABILATOR
FLT PATHSTAB
CHIPINT XMSN
CHIP MAIN MDL SUMP
MR DE-ICEFAULT
#1 RSVRLOW
#1 ENG INLETANTI-ICE ON
APU GEN ON
SEARCH LTON
#2 HYDPUMP
AUX FUEL
TAIL XMSNOIL TEMP
SAS OFF
IFF
CHIPTAIL XMSN
APU FAIL
TR DE-ICEFAIL
#2 RSVRLOW
#2 ENG INLETANTI-ICE ON
PRIME BOOSTPUMP ON
LDG LT ON
PILOT MOVE SERVO OFF SWITCH 1ST STAGE
RESULTING CONDITIONLoss of NO. 1 Primary Servo
BACK-UPRSVR LOW
#1 PRISERVO PRESS
#1 HYDPUMP
#1 RSVRLOW
BACK-UPPUMP ON
Leak is isolated by the pilot in the NO. 1 PRI servos
# 1 PRISERVO PRESS
TAIL ROTORQUADRANT
MAIN XMSNOIL TEMP
BOOST SERVOOFF
LFT PITOTHEAT
CHIP INPUTMDL - LH
CHIP ACCESSMDL - LH
MR DE-ICEFAIL
MAIN XMSNOIL PRESS
#1 ENGANTI-ICE ON
APU ON
APU ACCUMLOW
# 2 PRISERVO PRESS
# 1 TAIL RTRSERVO
APU OILTEMP HI
TRIM FAIL
RT PITOTHEAT
CHIP INPUTMDL - RH
CHIP ACCESSMDL - RH
ICEDETECTED
BACK-UPRSVR LOW
#2 ENGANTI-ICE ON
BACK-UPPUMP ON
#2 TAIL RTRSERVO ON
#1 HYDPUMP
IRCMINOP
INT XMSNOIL TEMP
STABILATOR
FLT PATHSTAB
CHIPINT XMSN
CHIP MAIN MDL SUMP
MR DE-ICEFAULT
#1 RSVRLOW
#1 ENG INLETANTI-ICE ON
APU GEN ON
SEARCH LTON
#2 HYDPUMP
AUX FUEL
TAIL XMSNOIL TEMP
SAS OFF
IFF
CHIPTAIL XMSN
APU FAIL
TR DE-ICEFAIL
#2 RSVRLOW
#2 ENG INLETANTI-ICE ON
PRIME BOOSTPUMP ON
LDG LT ON
Leak in #2 HYD System
LEAKAGE IN NO. 2
Partial Loss ofNO. 2 Resv Hyd Fluid
Activation of NO. 2Resv Level Sensing Switch
#2 RSVRLOW
Turns off PilotAssist Servos
BOOST SERVOOFF
TRIM FAIL
FLT PATHSTABSAS OFF
Logic module shuts the Pilot Assist shutoff valveat the NO. 2 Transfer Module
Increased Pedal and Collective Loads
If No Other Lights
Leak is in Pilot Assist Area
# 1 PRISERVO PRESS
TAIL ROTORQUADRANT
MAIN XMSNOIL TEMP
LFT PITOTHEAT
CHIP INPUTMDL - LH
CHIP ACCESSMDL - LH
MR DE-ICEFAIL
MAIN XMSNOIL PRESS
#1 ENGANTI-ICE ON
APU ON
APU ACCUMLOW
# 2 PRISERVO PRESS
# 1 TAIL RTRSERVO
APU OILTEMP HI
RT PITOTHEAT
CHIP INPUTMDL - RH
CHIP ACCESSMDL - RH
ICEDETECTED
BACK-UPRSVR LOW
#2 ENGANTI-ICE ON
BACK-UPPUMP ON
#2 TAIL RTRSERVO ON
#1 HYDPUMP
IRCMINOP
INT XMSNOIL TEMP
FLT PATHSTAB
CHIPINT XMSN
CHIP MAIN MDL SUMP
MR DE-ICEFAULT
#1 RSVRLOW
#1 ENG INLETANTI-ICE ON
APU GEN ON
SEARCH LTON
#2 HYDPUMP
AUX FUEL
TAIL XMSNOIL TEMP
BOOST SERVOOFF
TRIM FAILSTABILATOR SAS OFF
IFF
CHIPTAIL XMSN
APU FAIL
TR DE-ICEFAIL
#2 RSVRLOW
#2 ENG INLETANTI-ICE ON
PRIME BOOSTPUMP ON
LDG LT ON
If the Leak continues
Leak in #2 HYD System (Cont)Complete Loss of NO. 2
RSVR HYD fluid #2 HYDPUMP
#2 PRISERVO PRESS
BU Pump On BACK-UPPUMP ON
Pilot Assist ServosTurned On
BOOST SERVOOFF SAS OFF
TRIM FAIL FLT PATHSTAB
Power OnReset Press
•Logic module opens the Pilot Assist shutoff valve at the NO. 2 Transfer Module •Backup pump powers P.A.
If there are no other lights
leakage is upstream of the NO. 2 Transfer Module
# 1 PRISERVO PRESS
TAIL ROTORQUADRANT
MAIN XMSNOIL TEMP
BOOST SERVOOFF
LFT PITOTHEAT
CHIP INPUTMDL - LH
CHIP ACCESSMDL - LH
MR DE-ICEFAIL
MAIN XMSNOIL PRESS
#1 ENGANTI-ICE ON
APU ON
APU ACCUMLOW
# 2 PRISERVO PRESS
# 1 TAIL RTRSERVO
APU OILTEMP HI
TRIM FAIL
RT PITOTHEAT
CHIP INPUTMDL - RH
CHIP ACCESSMDL - RH
ICEDETECTED
BACK-UPRSVR LOW
#2 ENGANTI-ICE ON
BACK-UPPUMP ON
#2 TAIL RTRSERVO ON
#1 HYDPUMP
IRCMINOP
INT XMSNOIL TEMP
STABILATOR
FLT PATHSTAB
CHIPINT XMSN
CHIP MAIN MDL SUMP
MR DE-ICEFAULT
#1 RSVRLOW
#1 ENG INLETANTI-ICE ON
APU GEN ON
SEARCH LTON
#2 HYDPUMP
AUX FUEL
TAIL XMSNOIL TEMP
SAS OFF
IFF
CHIPTAIL XMSN
APU FAIL
TR DE-ICEFAIL
#2 RSVRLOW
#2 ENG INLETANTI-ICE ON
PRIME BOOSTPUMP ON
LDG LT ON
Leak in #2 HYD System (cont)
Partial Loss ofBackup Resv Hyd Fluid
Activation of BackupResv Level Sensing Switch
BACK-UPRSVR LOW
Leakage in 2nd Stage PRISERVO
NO PILOT ACTION PILOT MOVE SERVOOFF SWITCH1ST STAGE
NO PILOT ACTION
RESULTING CONDITION Loss of NO. 2 Primary Servo Loss of NO. Pilot Assist Servos
BACKUP PUMP INOP
BACK-UPRSVR LOW
#2 PRISERVO PRESS
#2 HYDPUMP
#2 RSVRLOW
SAS OFF TRIM FAILBOOST SERVO
OFF
FLT PATHSTAB
# 1 PRISERVO PRESS
TAIL ROTORQUADRANT
MAIN XMSNOIL TEMP
LFT PITOTHEAT
CHIP INPUTMDL - LH
CHIP ACCESSMDL - LH
MR DE-ICEFAIL
MAIN XMSNOIL PRESS
#1 ENGANTI-ICE ON
APU ON
APU ACCUMLOW
# 2 PRISERVO PRESS
# 1 TAIL RTRSERVO
APU OILTEMP HI
RT PITOTHEAT
CHIP INPUTMDL - RH
CHIP ACCESSMDL - RH
ICEDETECTED
BACK-UPRSVR LOW
#2 ENGANTI-ICE ON
BACK-UPPUMP ON
#2 TAIL RTRSERVO ON
#1 HYDPUMP
IRCMINOP
INT XMSNOIL TEMP
FLT PATHSTAB
CHIPINT XMSN
CHIP MAIN MDL SUMP
MR DE-ICEFAULT
#1 RSVRLOW
#1 ENG INLETANTI-ICE ON
APU GEN ON
SEARCH LTON
#2 HYDPUMP
AUX FUEL
TAIL XMSNOIL TEMP
BOOST SERVOOFF
TRIM FAILSTABILATOR SAS OFF
IFF
CHIPTAIL XMSN
APU FAIL
TR DE-ICEFAIL
#2 RSVRLOW
#2 ENG INLETANTI-ICE ON
PRIME BOOSTPUMP ON
LDG LT ON
PILOT MOVE SERVO OFF SWITCH 2ND STAGE
RESULTING CONDITIONLoss of NO. 2 Primary ServoPilot Assist Servo Pressure Supplied
by the Backup Pump
BACK-UPRSVR LOW
#2 PRISERVO PRESS
#2 HYDPUMP
#2 RSVRLOW
BACK-UPPUMP ON
# 1 PRISERVO PRESS
TAIL ROTORQUADRANT
MAIN XMSNOIL TEMP
LFT PITOTHEAT
CHIP INPUTMDL - LH
CHIP ACCESSMDL - LH
MR DE-ICEFAIL
MAIN XMSNOIL PRESS
#1 ENGANTI-ICE ON
APU ON
APU ACCUMLOW
# 2 PRISERVO PRESS
# 1 TAIL RTRSERVO
APU OILTEMP HI
RT PITOTHEAT
CHIP INPUTMDL - RH
CHIP ACCESSMDL - RH
ICEDETECTED
BACK-UPRSVR LOW
#2 ENGANTI-ICE ON
BACK-UPPUMP ON
#2 TAIL RTRSERVO ON
#1 HYDPUMP
IRCMINOP
INT XMSNOIL TEMP
FLT PATHSTAB
CHIPINT XMSN
CHIP MAIN MDL SUMP
MR DE-ICEFAULT
#1 RSVRLOW
#1 ENG INLETANTI-ICE ON
APU GEN ON
SEARCH LTON
#2 HYDPUMP
AUX FUEL
TAIL XMSNOIL TEMP
BOOST SERVOOFF
TRIM FAILSTABILATOR SAS OFF
IFF
CHIPTAIL XMSN
APU FAIL
TR DE-ICEFAIL
#2 RSVRLOW
#2 ENG INLETANTI-ICE ON
PRIME BOOSTPUMP ON
LDG LT ON
ReviewHydraulic SystemsComponent and LocationDescriptionLeak in No. 1 HYD SystemLeak in No. 2 HYD System
CONCLUSION
UH-60 HYDRAULICS LEAK ISOLATION– L.D.I. -- Isolates leaks in #1 T/R servo and
Pilot Assist Area– T.V. -- Isolates a leaking Hydraulic Pump– Pilot -- Isolates leaks in primary servos
QUESTIONS
?
Short Quiz
UH-60 HYDRAULICS LEAK ISOLATION– What isolates leaks in #1 T/R servo and Pilot
Assist Area?– What isolates a leaking Hydraulic Pump?– What isolates leaks in primary servos?