1. Presented By: FERHAN JAMAL ROLL NO - 0712231033 (E.C. Final Year) 1

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3. Assembly shop SHOP 1 SHOP 2 SHOP 3 SHOP 4 ALH Manufacturing shop NGL Shop Smith Shop Gyro shop Press Shop 3

4.  Basic Data  Length15.87 m  Main Rotor Diameter13.20 m  Height4.91 mMax.  Take-off Weight5500 kg  Useful Load2600 kgCabin  Fuel Capacity1100 kg  Performance  Cruising Speed250 km/ hr Max  Never Exceed 295 km/h  Oblique Rate of Climb620 m/min 4

5.  AC Electrical Distribution Box  DC Electrical Distribution Box  Filter Transformer Unit ( FTU )  Alternator Control and Protection Unit (ACPU)  Auxiliary Tank Probe  Radio Magnetic Indicator 5

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7.  Distributes the complete dc power generation. It contains the main bus through which dc power is directed to the overhead panel through circuit breakers for dc power distribution.  During normal operation, the total dc power from starter/generator is brought to the main bus through Normally Open (N.O.) contactor, which is controlled by GCPU. 7

8.  Input sources for DC Master Box:  Starter/generator along with GCPU: 6 KW  Battery (Ni-Cd): 40 Ah  External power source on ground: 6 KW  Types of O/P Buses: Main Bus – 200 A at 28 V DC through  100 A circuit breaker: 1 no.  50 A circuit breaker: 2 no.  3 A circuit breaker: 2 no. 8

9.  All grounding/reference lines are connected to a common negative point.  The chassis of the unit is kept isolated from the grounding points.  The bonding points are provided on the unit at the mounting points.  Transient suppressors and free wheeling diodes are also used in PCB circuit design.  The length of the leads/wires is kept as short as possible. 9

10.  Over voltage protection test (in normal & environmental condition)  Under voltage protection test (in normal & environmental condition)  Over/Under frequency  Vibration test  Functional test 10

11. External Power Control (EPC) card housed inside the DC Master Box provides the following functions when external power is selected to the Helicopter. Over voltage protection: At 30.5  1 V with a fixed time delay of 0.4  0.1 sec. Reverse polarity protection: If the polarity of the external power is reversed. 11

12. Manual Mode:  Corrected by appropriate design Partial Failure Mode:  One Generator FAIL  NE (Non Essential Bus OFF)  Only TIE Bus ON- Gives Supply to essential parts ONLY. Emergency Mode:  When Both Generators FAIL  Emergency Landing( Within 15 TO 20 Minutes) 12

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14. Functions: Rolling, Pitching & Yawing 14

15. GMC- Conservation of angular momentum Combination of electronics & mechanical portion Supply is 115v A.C. & 400 Hz 15

16. A gyroscope is a device for measuring or maintaining orientation 16

17. Five types of Gyroscopic Instrument:  GA-2M-Gyro Unit  BK53—Erection Cut off Switch  458K/458M-Gyro transmitter  DK-3—Cone Position Transmitter  1122 B: 17

18.  Rate of climb  the rate of change of a barometric pressure  static pressure is used  Caliberated leak 18

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20. Indicates the height of aircraft Visual reading on the front dial face Digitized signal to automatic altitude reporting devices 20

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