C-212-400 MAINTENANCE MANUAL

CHAPTER 79

LIST OF EFFECTIVE PAGES

CHAPTER CHAPTER
SUBJECT PAGE DATE SUBJECT PAGE DATE

List of
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2 Jul. 31/00

79-20-00 1 Jul. 31/00

2 Jul. 31/00

79-21-00 1 Jan. 01/98

2 Jan. 01/98
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604 Jun. 15/18

79-21-01 401 Jun. 15/13

402 Jun. 15/13
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406 Jun. 15/13

79-33-00 1 Jan. 01/98

2 Jan. 01/98
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CHAPTER 79

TABLE OF CONTENTS

CHAPTER/
SUBJECT SECTION PAGE EFF.

OIL SYSTEM 79-00-00 All

Description/Operation 1

DISTRIBUTION 79-20-00 All

Description/Operation 1

ENGINE OIL DISTRIBUTION 79-21-00 All

Description/Operation 1

Troubleshooting 101

Inspection/Check 601

OIL COOLER 79-21-01 All

Removal/Installation 401

ENGINE OIL INDICATING 79-33-00 All

Description/Operation 1

OIL PRESSURE TRANSMITTER EG5 (EG5) 79-33-01 All

Removal/Installation 401

OIL TEMPERATURE SENSOR EG6 (EG6) 79-33-02 All

Removal/Installation 401

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OIL SYSTEM

DESCRIPTION/OPERATION

1. General

The engine oil system has these sub-systems:

Distribution (Ref. 79-20-00, P. Block 1)

Engine Oil Indicating (Ref. 79-33-00, P. Block 1)

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DISTRIBUTION

DESCRIPTION/OPERATION

1. General

The engine mounted oil system includes an internal pressure pump and three
internal scavenge pumps. The scanvenge pumps, two in the reduction gear
section and one in the turbine section, return the oil to the cooling
system and the oil tank assembly. These components are included in the
engine manufacturers manual (EMM). The aircraft system components are a
cooler assembly (Ref. 79-21-00, P. Block 1) and flexible tubes.

Effectivity: See TOC

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 C-212-400 MAINTENANCE MANUAL
ENGINE OIL DISTRIBUTION

DESCRIPTION/OPERATION

1. General

The engine oil distribution system has a cooler assembly and flexible
tubes.

2. Component Location (Fig. 1)

ITEM FIN DESIGNATION ZONE ACCESS REFERENCE

PANEL

1. - Cooler Assembly 479 - 79-21-01

(489)

3. Description

Oil supply and return to the cooler assembly (the cooler) from the engine
is through flexible tubes which have quick-release connections.

4. Component Description

A. Cooler Assembly (Fig. 2)

The cooler assembly (9) has an inlet manifold (6), an outlet manifold
(5), a core assembly (8) and an oil return pan (4). An oil drain plug
(7) is located between the inlet and outlet manifolds, and a
thermostat (2) is installed at the inlet/outlet connections.

The core assembly (8) consists of a matrix and internal oil pipes.

The thermostat (2) has a bypass valve (1) to isolate the inlet and
outlet manifolds. Quick release connections (3) are installed to the
unit for easy maintenance.

The function of the cooler is to use ram air to cool the engine oil
within its operational limits.

Effectivity: See TOC

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 C-212-400 MAINTENANCE MANUAL
Engine Oil Distribution - Component Location

AM1.79.21.00.0AO.00.00-00

Fig. 1 Engine Oil Distribution - Component Location

Effectivity: See TOC

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 C-212-400 MAINTENANCE MANUAL

5. Operation (Fig. 2)

On initial operation, when the engine is cold, the bypass valve (1) is in
the open position. Oil supplied to the cooler goes to the inlet manifold
(6) and is then returned to the oil tank through the outlet manifold (5).

As the oil temperature increases to between 54ºC and 60ºC (130ºF and
140ºF) the bypass valve (1) starts to close. This lets some of the oil
into the core assembly where it is cooled by the core (8) and then
returned to the oil tank.

When the oil temperature gets to between 71ºC and 77ºC (160ºF and 171ºF)
the bypass valve closes and all the oil goes through the cooler. The
bypass valve controls the oil temperature between its operational limits.

To protect the cooler from too much pressure, a relief valve in the bypass
valve opens when the pressure is between 1,73 and 2,07 bar at temperature
of 82ºC to 88ºC (179ºF to 190ºF). This causes the oil to bypass the core
assembly.

Effectivity: See TOC

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Oil Cooler - Schematic

AM1.79.21.00.0BO.00.00-00

Fig. 2 Oil Cooler - Schematic

Effectivity: See TOC

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 C-212-400 MAINTENANCE MANUAL
ENGINE OIL DISTRIBUTION

TROUBLESHOOTING

1.

OIL TEMPERATURE HIGH. SUPPORT EQUIPMENT REQUIRED:

INSPECT TANK OIL LEVEL. FILL TANK TO CORRECT LEVEL

(Ref. 12-12-00, P. Block 301)
IS OIL LEVEL LOW? YES

NO

INSPECT COMPONENTS AND PIPING REPAIR OR REPLACE DEFECTIVE

OF THE OIL DISTRIBUTION AND PIPE OR COMPONENT (REF. ENGINE
TEMPERATURE INDICATING SYSTEM MANUFACTURER MAINTENANCE
FOR LEAKAGE. MANUAL).
YES
IS THERE A SYSTEM LEAK?

NO

INSPECT COOLER MATRIX. CLEAN MATRIX OR REPLACE OIL

COOLER ASSEMBLY
YES
IS MATRIX FAULTY? (Ref. 79-21-01, P. Block 401) .

NO

INSPECT THERMOSTATIC BYPASS REPLACE OIL COOLER ASSEMBLY

VALVE. (Ref. 79-21-01, P. Block 401) .
YES
IS VALVE FAULTY?

2.

Effectivity: See TOC

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OIL TEMPERATURE SLOW TO RISE TO SUPPORT EQUIPMENT REQUIRED:

CORRECT OPERATING FIGURE AND
REMAINS LOW THROUGH TEMPERATURE
RANGE.

INSPECT THERMOSTATIC BYPASS REPLACE OIL COOLER ASSEMBLY

VALVE. (Ref. 79-21-01, P. Block 401) .
YES
IS VALVE FAULTY?

Effectivity: See TOC

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 C-212-400 MAINTENANCE MANUAL
ENGINE OIL DISTRIBUTION

INSPECTION/CHECK

WARNING: BEFORE STARTING ANY MAINTENANCE WORK ON THE ENGINE SYSTEM, MAKE
SURE THAT WARNING NOTICES PREVENTING ENGINE STARTING OR GROUND
RUNNING ARE CLEARLY SHOWN IN THE FLIGHT COMPARTMENT.

1. Cooler Assembly - General Check

A. Reason for the Job

(1) Cooler assembly physical condition - monitoring.

B. Equipment and Materials

ITEM DESIGNATION

(1) - Servicing Platform, 2 m (6,5 ft)

(2) ITEM 20-15-01 Circuit Breaker Safety Clips and tags
(3) - Warning Notice

Referenced Procedure:

- 71-10-02, P. Block 401 - Center Zone Cowlings

C. Procedure (Fig. 601)

(1) Job Set-Up

(a) Put warning notice in the flight compartment.

(b) Open, safety and tag START L (R) circuit breakers, KA1
(KA2).

(c) Put the servicing platform in position.

(2) Inspection of the Cooler Assembly

(a) Open the cowlings (Ref. 71-10-02, P. Block 401).

Effectivity: See TOC

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Oil Cooler Inspection Areas

AM1.79.21.00.6AO.00.00-00

Fig. 601 Oil Cooler Inspection Areas

Effectivity: See TOC

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 C-212-400 MAINTENANCE MANUAL

(b) Inspect these items:

- Quick-release couplings (1)
- Thermostat housing (2)
- Plate and cooler assembly (3)
- Matrix core assembly (4)
- Intake (5)

for cracks, damage, distortion, corrosion and correct

assembly.

(c) Inspect the items in step (b) for leaks. No leaks are
permitted.

(d) Open the oil drain access panel (6).

(e) Inspect the oil drain plug (7) for leaks. No leaks are
permitted.

(f) Close the oil drain access panel (6).

(3) Close-Up

(a) Remove all tools and equipment from the work area. Make sure
that the work area is clean.

(b) Close the cowlings (Ref. 71-10-02, P. Block 401) .

(c) Remove the access platform.

(d) Remove the circuit breaker safety clips and tag.

(e) Close START L (R) circuit breakers, KA1 (KA2).

(f) Remove the warning notice.

Effectivity: See TOC

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OIL COOLER

REMOVAL/INSTALLATION

WARNING: BEFORE STARTING ANY MAINTENANCE WORK ON THE ENGINE SYSTEM, MAKE
SURE THAT WARNING NOTICES PREVENTING ENGINE STARTING OR GROUND
RUNNING ARE CLEARLY SHOWN IN THE FLIGHT COMPARTMENT.

WARNING: BE CAREFUL WITH THE SPILLED OIL WHEN YOU REMOVE THE HOSES. THE HOT
OIL CAN BURN YOUR SKIN. USE GLOVES AND PROTECTION GOGLEES.

WARNING: BE CAREFUL WHEN YOU USE OILS AND GREASES.

OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND THE LOCAL
REGULATIONS.
USE PROTECTIVE CLOTHING, GOGGLES AND GLOVES.

IF YOU GET OIL OR GREASE:

- ON YOUR SKIN, REMOVE IT WITH SOAP AND CLEAN WATER
- IN YOUR EYES OR IN YOUR MOUTH, FLUSH IT AWAY WITH CLEAN WATER
- GET MEDICAL AID.

IN GENERAL, OILS AND GREASES ARE POISONOUS AND SKIN IRRITANTS.

CAUTION: APPROVED OILS USED IN THE ENGINE SYSTEM CAN CAUSE DAMAGE TO
PAINTWORK AND CERTAIN TYPES OF RUBBER. TAKE CARE NOT TO SPILL OIL
ON THE AIRCRAFT STRUCTURE AND SYSTEMS. ANY SPILT OIL MUST BE
REMOVED IMMEDIATELY.

CAUTION: TAKE STRINGENT PRECAUTIONS TO AVOID CONTAMINATION OF THE OIL

SYSTEM. FIT PROTECTIVE BLANKS TO PIPE UNIONS AND ADAPTERS
IMMEDIATELY AFTER DISCONNECTION.

CAUTION: DISPOSE OF DRAINED OIL IN ACCORDANCE WITH LOCAL SAFETY REGULATIONS.

DO NOT REPLENISH SYSTEM WITH USED OIL.

1. Reason for the Job

To remove and install the oil cooler when it is unserviceable or to get

access to other components.

Effectivity: See TOC

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2. Equipment and Materials

ITEM DESIGNATION

A. ITEM 20-15-01 Circuit Breaker Safety Clip and Tag

B. Standard Tool Servicing Platform, 2 m (6.5 ft)
C. Standard Tool Warning Notices
D. Standard Tool Oil Drainage Container
E. Standard Tool Pipe Protection Plug and Cap
F. AS28778-8 Preformed Packing
G. 100-904-8815 Preformed Packing
H. - Lockwire, 0,71 mm (0.028 in)

Referenced Procedures:

- 12-12-00, P. Block 301 - Engine Lubrication

- 20-21-00, P. Block 1 - Standard Torques
- 71-00-00, P. Block 501 - Powerplant
- 71-10-02, P. Block 401 - Center Zone Cowlings

3. Procedure

A. Job Set-Up

(1) Put the warning notices in position .

(2) Open, safety and tag, with ITEM 20-15-01, the circuit breakers:

PANEL SERVICE FIN

OVERHEAD START L KA1

OVERHEAD START R KA2

(3) Put the servicing platform in position.

(4) Put the oil drainage container in position.

B. Removal (Fig. 401)

Effectivity: See TOC

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 C-212-400 MAINTENANCE MANUAL
(1) Open the oil drain panel (4).

(2) Remove and discard the lockwire of the oil drain plug (5).

(3) Remove the oil drain plug (5) and drain the oil.

(4) Remove and discard the preformed packing (6).

(5) Install the drain plug (5) and close the oil drain panel (4).

(6) Open the side cowlings (Ref. 71-10-02, P. Block 401).

(7) Disconnect oil inlet (8) and outlet (9) quick-release couplings.

(8) Remove and discard the preformed packing (10).

(9) Install pipe protection plugs and caps on the quick-release

couplings and oil cooler ports.

(10) Remove the cooler cowling (Ref. 71-10-02, P. Block 401).

(11) Remove the bolts (1) and the plate (2).

(12) Carefully remove the cooling assembly (11) from the cowling (3).

C. Preparation of Replacement Component

(1) Make sure that the replacement component has no damage or

corrosion.

D. Preparation for Installation (Fig. 401)

(1) Remove the oil drain plug (5) from the cooler (11) .

(2) Remove the pipe protection plugs and caps from the oil cooler
ports.

(3) Flush the cooler (11) with clean engine oil.

(4) Install a new preformed packing (6) , 100-904-8815, to the oil

drain plug (5).

(5) Install the oil drain plug (5) to the housing (7). Torque the
oil drain plug (5) to 30 lb.in (3,4 Nm) and safety it with a new
lockwire.

(6) Examine the cowling area where the cooler (11) will be
installed. Make sure that there is no damage or corrosion.

Effectivity: See TOC

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 C-212-400 MAINTENANCE MANUAL

E. Installation (Fig. 401)

(1) Put the cooler (11) in position on the cowling (3).

(2) Put the plate (2) in position and attach the cooler (11) and the
plate (2) with the bolts (1). Tighten the bolts (1) to the
standard torque value (Ref. 20-21-00, P. Block 1).

(3) Install the cooler cowling (Ref. 71-10-02, P. Block 401).

(4) Remove the pipe protection plugs and caps from the couplings.

(5) Install the preformed packing (10), AS28778-8.

(6) Connect the oil inlet (8) and outlet (9) quick-release couplings.

(7) Fill the engine oil system (Ref. 12-12-00, P. Block 301).

(8) Close the side cowlings (Ref. 71-10-02, P. Block 401).

F. Test

(1) Remove the safety clips and tags, ITEM 20-15-01, and close the
circuit breakers:

PANEL SERVICE FIN

OVERHEAD START L KA1

OVERHEAD START R KA2

(2) Do the engine ground test (Ref. 71-00-00, P. Block 501).

(3) Open the side cowlings (Ref. 71-10-02, P. Block 401).

(4) Examine the cooler installation for oil leaks. Make sure that
there is no leaks.

G. Close-Up

(1) Close the side cowlings (Ref. 71-10-02, P. Block 401).

(2) Remove the oil drainage container.

(3) Remove the servicing platform.

Effectivity: See TOC

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 C-212-400 MAINTENANCE MANUAL

(4) Remove the warning notices.

(5) Remove all tools and equipment from the work area. Make sure that
the work area is clean.

Effectivity: See TOC

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Oil Cooler

AM1.79.21.01.4AO.00.00-01

Fig. 401 Oil Cooler

Effectivity: See TOC

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ENGINE OIL INDICATING

DESCRIPTION/OPERATION

1. General

Each engine has an oil pressure/temperature indicating system. The system

gives data to the multifunction display system (MFDS).

2. Component Location (Fig. 1)

ITEM FIN DESIGNATION ZONE ACCESS REFERENCE

PANEL

1. EG5 Oil Pressure 412 - 79-33-01

(EG5) Transmitter (422)
2. EG6 Oil Temperature 412 - 79-33-02
(EG6) Sensor (422)

3. Description

Each system has an oil pressure transmitter and oil temperature sensor.

4. Component Description

A. Oil Pressure Transmitter

The transmitter is installed on the RH side of the engine gear box

casing. Its function is to sense oil pressure and send a signal to
the MFDS.

B. Oil Temperature Sensor

The sensor is installed in the engine oil supply line. Its function
is to sense the oil temperature and send a signal to the MFDS.

Effectivity: See TOC

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 C-212-400 MAINTENANCE MANUAL
Engine Oil Pressure/Temperature Indicating System - Component Location

AM1.79.33.00.0AO.00.00-00

Fig. 1 Engine Oil Pressure/Temperature Indicating System - Component Location

Effectivity: See TOC

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 C-212-400 MAINTENANCE MANUAL

5. Operation (Fig. 2)

During engine operation the oil pressure is sensed by a diaphragm in the

oil pressure transmitter. Movement of the diaphragm causes a signal to be
sent to the MFDS which in turn displays the oil pressure. Changes in the
temperature of the oil are sensed by a coil in the temperature sensor. An
increase or decrease in the temperature causes the resistance of the coil
to change. This change is converted to a signal which is then sent to the
MFDS.

Effectivity: See TOC

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 C-212-400 MAINTENANCE MANUAL
Engine Oil Pressure/Temperature Indicating System - Electrical Schematic

AM1.79.33.00.0BO.00.00-00

Fig. 2 Engine Oil Pressure/Temperature Indicating System - Electrical

Schematic

Effectivity: See TOC

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 C-212-400 MAINTENANCE MANUAL
OIL PRESSURE TRANSMITTER EG5 (EG5)

REMOVAL/INSTALLATION

WARNING: BEFORE STARTING ANY MAINTENANCE WORK ON THE ENGINE SYSTEM, MAKE
SURE THAT WARNING NOTICES PREVENTING ENGINE STARTING OR GROUND
RUNNING ARE CLEARLY SHOWN IN THE FLIGHT COMPARTMENT.

1. Equipment and Materials

ITEM DESIGNATION

(1) - Servicing Platform, 2 m (6,5 ft)

(2) ITEM 20-15-01 Circuit Breaker Safety Clips and Tags
(3) - Warning Notices
(4) - Blanking Caps
(5) - Lockwire

Referenced Procedures:

- 71-00-00, P. Block 501 - Power Plant

- 71-10-01, P. Block 401 - Upper Center Cowling 473 (483)

2. Procedure

A. Job Set-Up

(1) Put warning notice in the flight compartment.

(2) Open, safety and tag START L (R) circuit breakers, KA1 (KA2).

(3) Put the servicing platform in position.

(4) Remove the upper center cowling (Ref. 71-10-01, P. Block 401).

B. Removal (Fig. 401)

(1) Remove and discard the lockwire from the connector (11).

(2) Disconnect the connector (11) and put blanking caps on the
connector and the receptacle (10).

Effectivity: See TOC

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 C-212-400 MAINTENANCE MANUAL
Oil Pressure Transmitter EG5 (EG5)

AM1.79.33.01.4AO.00.00-00

Fig. 401 Oil Pressure Transmitter EG5 (EG5)

Effectivity: See TOC

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 C-212-400 MAINTENANCE MANUAL

(3) Loosen the screw (6).

(4) Remove and discard the lockwire from the screw (3).

(5) Remove the screws (1) and (3).

(6) Remove the clamp (2).

(7) Disconnect the union (7) and remove the transmitter (9).

(8) Put blanking caps on all open connections.

C. Installation (Fig. 401)

(1) Remove all the blanking caps.

(2) Install the transmitter (9) to the pipe assembly (8) and tighten
the union (7).

(3) Put the clamp (2) in position with the lug (4) below the lug of
the clamp (5).

(4) Tighten screw (6).

(5) Install screws (1) and (3).

(6) Connect the connector (11).

(7) Safety the connector (11) and the screw (3) with lockwire.

(8) Remove all tools and equipment from the work area. Make sure that
the work area is clean.

(9) Install the upper center cowling (Ref. 71-10-01, P. Block 401).

(10) Remove the servicing platform.

(11) Remove the circuit breaker safety clips and tags.

(12) Close START L (R) circuit breakers, KA1 (KA2).

(13) Remove the warning notices.

Effectivity: See TOC

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 C-212-400 MAINTENANCE MANUAL

D. Test

(1) Do an engine ground test (Ref. 71-00-00, P. Block 501).

(2) Remove the upper center cowling (Ref. 71-10-01, P. Block 401).

(3) Examine the transmitter installation for oil leaks. No leaks are
permitted.

E. Close-Up

(1) Remove all tools and equipment from the work area. Make sure that
the work area is clean.

(2) Install the upper center cowling (Ref. 71-10-01, P. Block 401).

Effectivity: See TOC

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 C-212-400 MAINTENANCE MANUAL
OIL TEMPERATURE SENSOR EG6 (EG6)

REMOVAL/INSTALLATION

WARNING: BEFORE STARTING ANY MAINTENANCE WORK ON THE ENGINE SYSTEM, MAKE
SURE THAT WARNING NOTICES PREVENTING ENGINE STARTING OR GROUND
RUNNING ARE CLEARLY SHOWN IN THE FLIGHT COMPARTMENT.

1. Equipment and Materials

ITEM DESIGNATION

(1) - Servicing Platform, 2 m (6,5 ft)

(2) ITEM 20-15-01 Circuit Breaker Safety Clips and Tags
(3) - Warning Notices
(4) - Blanking Caps
(5) - Preformed Packing
(6) - Lockwire

Referenced Procedures:

- 71-00-00, P. Block 501 - Power Plant

- 71-10-02, P. Block 401 - Side Cowling 475 (485)

2. Procedure

A. Job Set-Up

(1) Put warning notices in the flight compartment.

(2) Open, safety and tag START L (R) circuit breakers, KA1 (KA2).

(3) Put the servicing platform in position.

(4) Open the side cowling (Ref. 71-10-02, P. Block 401).

B. Removal (Fig. 401)

(1) Remove and discard the lockwire from the connector (1).

(2) Disconnect the connector (1) and put blanking caps on the
connector and the receptacle of the sensor (2).

(3) Remove the sensor (2) and discard the preformed packing (3).

Effectivity: See TOC

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 C-212-400 MAINTENANCE MANUAL
Oil Temperature Sensor EG6 (EG6)

AM1.79.33.02.4AO.00.00-00

Fig. 401 Oil Temperature Sensor EG6 (EG6)

Effectivity: See TOC

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 C-212-400 MAINTENANCE MANUAL

(4) Put a blanking cap on the sensor housing (4).

C. Installation (Fig. 401)

(1) Remove all the blanking caps.

(2) Install the preformed packing (3) to the new sensor (2).

(3) Install the sensor (2) to the housing (4).

(4) Torque tighten the sensor (2) to a value of 7,34 Nm (65 lbf in.).

(5) Connect the connector (1).

(6) Safety the connector (1) and the sensor (2) with lockwire.

(7) Remove all tools and equipment from the work area. Make sure that
the work area is clean.

(8) Close the side cowling (Ref. 71-10-02, P. Block 401).

(9) Remove the servicing platform.

(10) Remove the circuit breaker safety clips and tags.

(11) Close START L (R) circuit breakers, KA1 (KA2).

(12) Remove warning notices.

D. Test

(1) Do an engine ground test (Ref. 71-00-00, P. Block 501).

(2) Open the side cowling (Ref. 71-10-02, P. Block 401).

(3) Examine the sensor installation for oil leaks. No leaks are
permitted.

E. Close-Up

(1) Remove all tools and equipment from the work area. Make sure that
the work area is clean.

(2) Close the side cowling (Ref. 71-10-02, P. Block 401).

Effectivity: See TOC

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Effectivity: See TOC

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