(2)
Because the extent of repair and replacement will vary with each engine, the type of test required to ensure that satisfactory maintenance has been performed will vary also. To minimize ground running and to conserve fuel, this section provides ground test procedures which are related to the extent of repair or replacement. Prior to testing an engine after repair or replacement, see the Repair Reference Table (Fig. 501), to determine the test required.
(3)
A pretrimmed engine is an engine that has been trimmed and acceleration/deceleration checked on a test stand in accordance with following:
(a)
Trim and check runs were accomplished with following items installed: 1) Flight inlet (nose cowl) or bellmouth without screen: 2) Flight exhaust system or reference tailpipe. 3) All quick-engine-change (QEC) accessories (Ref 71-03-01, Boeing 737
Overhaul Manual, Power Pack Assembly (Engine Buildup Section)].
(b)
Trim targets and acceleration/deceleration check requirements were as specified in 71-09-200, Power Plant (JT8D) - Trim Procedure.
B. Equipment and Materials
(1)
Airplane interphone equipment
(2)
Jetcal Analyzer, or equivalent (Howell Instruments, Inc., Ft. Worth, Texas)
C. Prepare for Power Plant Test
(1)
When cleaning engines prior to tests, following precautions must be taken:
(a)
Protect all prepacked bearings, such as cross-shaft or control rod linkage bearings.
CAUTION: IF FUEL LINES ARE TO BE DISCONNECTED, PREPACKED BEARINGS IN THE AREA MUST BE PROTECTED FROM ANY LOST FUEL.
(b)
Protect pressure ratio bleed control.
(c)
Protect silicone rubber shock mounts on oil tank and oil tank strap. Wash down area as soon as possible after washing with cleaning solution.
(2)
Connect interphone equipment at engine to be tested.
(3)
Remove engine cowl panels.
(4)
Refer to 71-09-100, Power Plant (JT8D)-Operating Procedure, for engine start
procedures.
501
May 15/78 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 71-00 Page 501
Units Replaced or Required Testing and/or Minimum Thrust Required for Ground Check Run
Accessory Drive Anti-Icing Valve Bearing, No. 6 No. 1 or No. 6 Bearing Oil Scavenge Pump Bleed Valves (Anti-Surge) Combustion Chambers Combustion Chamber Outlet Ducts (Inner and Outer) Compressor Inlet Section No. 1 Bearing and Seal, Inlet Case, Disk Spacer, Individual Fan Blades, 1st- and 2nd-Stage Fan Blades, 1st-and 2nd-Stage Stators, Fan Cases 1st- and 2nd-Stage Disk and Blade Assembly FILTERS Fuel Pump Filter P&D Valve Strainer Fuel Control Filter Fuel Control Fuel Deicing Heater Fuel Deicing Shutoff Valve Actuator Fuel Flow Transmitter Fuel Manifold Assembly Fuel Nozzles Test A *[1] Observe Valve Position Indicator on Body of Valve While Actuating System from Cockpit, with Engine Not Running Test H and Breather Test Ref 79-21-0 Test A *[1] or monitoring Test E Test B Test F Test B, H Test H and Ref 79-21-0 MP *[7] Test C Test D, G Test C Observe Valve Position Indicator on Body of Valve While Actuating System from Cockpit, with Engine Not Running Test C Test B, G Test B, G
Repair Reference Table 501
71-00 Figure 501 (Sheet 1) May 01/99
Page 502
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
Units Replaced or Required Testing and/or Minimum Thrust Required for Ground Check Run
Fuel Pump (Same Fuel Control) Fuel Pump (Different Fuel Control) Fuel P&D Valve Fuel Pressure Differential Switch Fuel-Oil Cooler Fuel-Oil Cooler Bypass Valve Gearbox, Main Accessory Drive Ignition Components Instrumentation Pt7 Probes and Tubing EGT Probes and Harness Oil Pump Oil Strainer/Filter Oil Pressure Regulating Valve Oil Tank Pressure Ratio Bleed Control Start Valve Tubing Fuel (Low Pressure) Fuel (High Pressure) Oil Anti-Surge Bleed Valve Turbine Nozzle (Vanes) Test B, G *[3] Test D, G Test C *[4] Test A Test C Test A Test B Aural Check Test B Test A *[1] Test A *[1] *[7] Test A *[2] Test A *[1] Test E Check that starter cutout (N2 RPM) is normal on first engine start. On start valve with open indication light, check that light is also extinguished Test A Test C Test A *[1] Test E Test B
Gravel Protection System Test B
511 Repair Reference Table
May 01/99 Figure 501 (Sheet 2) 71-00
Page 502A/502B
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
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