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Helicopter
Helo maintenance/ vibe analysis
Question | Answer |
---|---|
T700-GE-401/-401C are what type of driven modular engines | front-driven |
The power turbine shaft, which has a rated speed of | 20,900 rpm |
Compressor aft borescope ports are at what station | Compressor aft borescope ports are at what station |
thermocouple ports/power turbine inlet is at what station | 4.5 |
how many stations in the engine | 5 |
type of compressor | combined axial/centrifugal |
number of compressor stages | 6 stages: 5 axial and 1 centrifugal |
type of combustion chamber | single annular chamber with axial flow |
no. 5 carbon seal, and no. 5 and no. 6 bearing support is located in | exhaust frame |
No. ___ and no. ___ bearings support the aft end of the PT shaft assembly; the forward end is supported by the ___ shaft | 5, 6, output |
the hot section module consists of three subassemblies: | combustion liner stage 1 nozzle assembly, the gas generator turbine rotor, and a stator assembly which includes the stage 2 nozzle. |
stage 1 nozzle assembly contains how many air-cooled nozzle segments | 12 |
the accessory section module mounts on the ___ section module at the ___ o'clock position | cold, 12 |
no. 1 and no. 2 main bearings located at | A-Sump output shaft assembly |
the combustion liner and the B-sump located at | the midframe assembly |
(-401) engines that have complied with ECP 700162 do not have ___ | electrical control unit (ECU) |
(-401) engines that have complied with ECP 700162 have a ___ | digital electronic control (DEC) |
When to accomplish output shaft balancing? | High pitch whine audible in the engine/input module area. Vertical axis vibration level at 20,900 RPM exceeds .5 IPS during input module monitoring check |
When to accomplish engine non-synchronous vib check? | Following engine replacement. If engine de-swirl duct clamp cracks or breaks. Following occurrence of a sump leak (#1 Eng carbon seal replacement) |
What is Non-Synchronous (NSV) Vibration | Vibration that occurs in a component at some RPM other than the rotating RPM of the component |
What is Axial Fan Health Monitoring ? | A vibration check of the oil cooler blower can assembly and associated driveshafts accomplished using a ground run only. One accelerometer is used for the test and no tachometer installation is required |
When to perform tail rotor balancing ? | (1) Any time tail rotor assembly dynamic component dynamic components are removed and replaced (2) Tail rotor blade tip cap is removed or replaced. (3) When tail rotor rigging is performed (4) Post Phase, post IMP, post STEP, post ASLE |
ATABS Optical Tachometer and Reflective Tape Installation for Main Rotor Tuning. What color is the Pitch Control Rod ? | BLUE |
ATABS Optical Tachometer and Reflective Tape Installation for Main Rotor Tuning. Where is the tachometer located? | MAIN ROTOR |
ATABS Optical Tachometer and Reflective Tape Installation for Main Rotor Tuning. What color is No. 1 blade? | RED |
ATABS Optical Tachometer and Reflective Tape Installation for Main Rotor Tuning. What color is No.2 blade? | BLUE |
ATABS Optical Tachometer and Reflective Tape Installation for Main Rotor Tuning. What is color of No. 3 blade? | YELLOW |
ATABS Optical Tachometer and Reflective Tape Installation for Main Rotor Tuning. What is color of No. 4 blade | BLACK |
what temp. should the engine be allowed to cool to before borescoping? | 100 degrees Fahrenheit |
borescope can be damaged if it comes in contact with parts hotter then what? | 150 degrees Fahrenheit |
what are the crack limits in the compressor section? | there are none |
how many borescope ports are there on the compressor? | 3 ports |
what position are the igniters in on the combustion section? | 4th and 6th position |
what's the function of the cyclic stick | controls left, right, forward, and backward movement |
whats the function of the collective | controls vertical movement |
purpose of the main gear box | transfer power to the main rotor head |
purpose of the tail gear box | transfers power to the tail rotor |