Chinook CH-47/Servicing

SECTION 9. SERVICING

1 GENERAL

This section describes fluid (other than fuel) and servicing/repair procedures. Fueling procedures can be found in Section 2 - Systems (Fuel Systems).

2 ENGINES

Figure 1: Engine Compartment

Figure 2: Maintenance Panel

The engines are located on either side of the aft pylon. The engine on left side when looking forward is the #1 engine, and the engine on the right side is the #2 engine. Each engine has a cowling that can be opened for access to the internals. Click on the engine to check for damage, or repair any existing damage.

Each engine has 12 quart oil reservoir. Engines should not be operated with less than 6 quarts. The oil level is detected by a float mechanism. This float mechanism triggers the low oil warning lights in the cockpit, and an orange indicating line near the forward section of the engine. Click on the red cap to add two quarts of oil to an engine.

3 MAINTENANCE PANEL

The maintenance panel is located on the right side of the aircraft in the rear near the ramp. The flight engineer should periodically monitor the panel for indications of transmission or hydraulic issues.

3.1 Transmission

The transmission section of the maintenance panel contains 5 rows of warning lights. Each column shows the status of one of the transmissions systems. The rows are:

• CHIP DETECTOR - Indicates metal fragments have been detected in the affected system. A CHIP light indicates an impending catastrophic failure. The helicopter should land immediately in the event of a CHIP light.
• DEBRIS SCREEN - Indicates the oil debris screen is partially or totally blocked impeding the flow of oil through the transmission.
• MAIN OIL PRESS - Indicates oil pressure in the affected system is low.
• AUX OIL PRESS - Indicates oil pressure in the affected auxiliary system is low.
• OVERTEMP - Indicates the oil temperature in affected system is above limits. Continued operation with an OVERTEMP can lead to damage of that system.

3.2 Engine Chip Lights

Below the transmission section are the engine chip detector lights. These lights indicate that metal fragments have been detected in the engine oil and that an engine failure is possible. The effected engine should be shut down an secured immediately in the event of an engine chip light and the helicopter should be landed as soon as practicable.

3.3 Ground Contact

Two ground contact lights are located next to the engine chip detector lights. These lights indicate the rear wheel compression switches have been activated. These lights should be on while the helicopter is on the ground.

3.4 Hydraulic System

Two rows of gauges show the pressure and temperature of the hydraulic systems. These should be monitored periodically for normal readings.

Below the temperature gauges are the reservoir level gauges. The flight control hydraulic systems share a single gauge with a switch to select which system fluid level to show. The utility hydraulic level gauge has two scales depending on whether the ramp is up or down. When a level gauge is indicating below the ADD line, hydraulic fluid should be added to the appropriate system.

A "LEVEL CHECK" button is located next to the level gauges. This can be used to display hydraulic fluid levels when the aircraft is shut down. Press and hold the button to display the current fluid level.

Additional hydraulic system warning lights are located below the level gauges. FILTER CHANGE lights indicate a hydraulic fluid filter needs to be replaced. PUMP FAULT lights indicate that the pump for a particular systems has hard failed and requires repair.

3.5 System Test

A ground test switch is located in the lower right corner of the panel. When switched to TEST, all panel lights will illuminate.

4 TRANSMISSION SYSTEMS

The Chinook has five transmission gearboxes, each of which must be individually inspected, and each with its own lubrication system. Min and max oil levels for each system are as follows:

Fluid	Max Capacity (quarts)	Min Capacity (quarts)
#1 Engine Oil	12	6
#2 Engine Oil	12	6
Forward Transmission	26	13
Aft Transmission	41	21
#1 Eng. Transmission	10	5
#2 Eng. Transmission	10	5
Combining Transmission	20	10
#1 Flight Control Hydraulics	9.6	8
#2 Flight Control Hydraulics	9.6	8
Utility Hydraulics	21.6	18