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?