References:

[a] Boeing C-40A Aircraft Maintenance Manuals, Part 1, System Description Section

202.1 SYSTEM COMPONENTS AND COMPONENT PARTS

Referring to a standard print of this system or the actual equipment, identify the following system components and component parts and discuss the designated items for each:

A. What is its function?
B. Where is it located?

202.1.1 Engine:

a. Fan

Function and Location:

The engine fan diameter is 61 inches. The fan increases the speed of the air. The primary air-flow goes into the core of the engine. The secondary air- flow goes in the fan duct. It supplies approximately 80 percent of the thrust during take-off.

b. Compressors

Function:

The High Pressure Compressor increases the pressure of the air from the Low Pressure Compressor and sends it to the combustor.

c. Turbines

Function:

The High Pressure Turbine is a single-stage turbine. It changes the energy of the hot gases into a mechanical energy.
The Low Pressure Turbine is a four-stage turbine. It changes the energy of the hot gases into a mechanical energy.

d. Accessories

Function:

The accessory drive has these components:

Inlet gear box (IGB)
Radial drive shaft (RDS)
Transfer gear box (TGB)
Horizontal drive shaft (HDS)
Accessory gear box (AGB)

a. Cowlings

Function and Location:

The engine cowling gives an aerodynamically smooth surface into and over the engine. It also gives a protective area for engine components and accessories.

b. Electronic Engine Controls (EEC)

Function and Location:

The electronic engine control (EEC) is the main component of the engine fuel and control system and is located on the left side of the engine. The EEC controls the engine.

c. Thrust reversers

Function and Location:

The thrust reverser (T/R)
The T/R system changes the direction of the fan air exhaust to help decrease the speed of the airplane after landing or during a rejected takeoff (RTO).

d. Engine fuel distribution

Function and Location:

The engine fuel and control system calculates the quantity of fuel necessary to make the commanded thrust.

e. Oil

Function and Location:

The engine oil system supplies oil to lubricate, cool, and clean the engine bearings and gears. The engine oil tank is on the fan case, at the 3:00 position.

f. Engine indicating

Function and Location:

The engine indicating system continuously supplies engine data to the common display system (CDS).

g. Fire/overheat protection

Function and Location:

The engine over-heat and fire detection system uses detectors on the engine to monitor engines/APU for overheat and fire conditions in the engine area. The indications are on the P7 glare shield panel and on the engine and APU fire control panel. A bell also operates in the flight compartment for an engine fire.

202.1.3 Auxiliary Power Unit (APU):

a. Electronic Control Unit (ECU)

Function and Location:

The ECU monitors APU functions using built in test equipment (BITE). The APU electronic control unit (ECU) is in the aft cargo compartment.

b. Indication and warning system

Function and Location:

The APU indicating system consists of these components:
EGT gauge
Data Memory Module
Control display unit (CDU)

The APU indications are on the P5-4 panel and the P9 panel.

202.2 PRINCIPLES OF OPERATION

None to be discussed.

202.3 PARAMETERS/OPERATING LIMITS

None to be discussed.

202.4 SYSTEM INTERFACE

None to be discussed.

202.5 SAFETY PRECAUTIONS

202.5.1 What safety precautions must be observed when operating this system?

Perform fod walk in front of and around engine ingestion area prior to engine start.
At idle power, the inlet hazard area is a 10 ft radius around the inlet.
The engine exhaust is very hot for long distances behind the engine. This can cause damage to personnel and equipment. Exhaust velocity is very high for long distances behind the engine. This can cause damage to personnel and equipment.
Engine noise can cause temporary and permanent loss of hearing. You must wear ear protection when near an engine in operation.
Use the entry/exit corridor when the engine is in operation. Also, stay out of the inlet and exhaust areas when the engine is in operation. The beacon light must be on while the engines are operating.

202.5.2 What special safety precautions apply to hazard zones?

If the wind is over 25 knots, increase the inlet hazard area by 20 percent.
For additional safety, wear a safety harness when the engine is in operation.