The following specification particularly describes the nature of invention of Hand controller and the manner in which it is to be performed.
BACKGROUND OF INVENTION:
Hand controller had been procured from UK. This item is expensive and spares were not available to repair this item. The repair facility at OEM is no longer available to repair the unit. The aircraft cannot be cleared for flight in absence of this unit. Hence, it was decided to develop the unit to increase the serviceability of Jaguar fleet and to fulfil 'Make in India ' initiative. OBJECTIVE OF INVENTION:
The main objective of the invention is to invent new Hand controller to replace the original Hand controller which is no longer available for procurement and repair facility is also not available . This development endeavour will promote foreign exchange savings , increase the serviceability of Jaguar fleet and broaden the technology base of our country.
DETAIL DESCRIPTION OF INVENTION:
Hand controller which is an integral part of DARIN II Navigation and weapon aiming system of Jaguar military Aircraft.. This unit is a part of HOTAS (Hand on throttle and stick), which allows the pilot to access vital cockpit functions without removing hand from the throttle. This unit is fitted on the left console of the Jaguar aircraft cockpit.The Hand Controller provides facilities for inserting two analogue and two digital signals into the Mission computer.
a. Hand controller consists a plate which is attached to an aluminum alloy rectangular
chassis.
b. The chassis provides housing for the vertically mounted printing assemblies, containing
the AC To DC Convertpr and servo amplifier components, relays and connectors.
c. The PCBs will be populated with the MIL qualified components.
d. An aluminum alloy cover protects the chassis components.
e. The open end of the cover engages a lip formed on the mounting plate to provide a dust
seal.

f. A hole in the cover provides an outlet for the connectors.
g. The unit will have name plate with details engraved. The name plate will contain Name
of the unit, Serial number, and manufacturer details and modification status.
h. Reverse polarity protection has been provided to the unit. i. EMI Filters are provided for Filter Purpose.

Mechanical:
Dimension :144X105X56rhm (Approximately)
Weight :Less than 700 grams
Material :Aluminum to Spec 6061T651 or equivalent
Finish :Black Powder Coated
i


Performance Characteristics & Functional Requirements:
All output signals are inhibited until RLA and RLB are energized by the arrival of +28V DC
side to side movement to the thump control button in the throttle, results in a disturbance to the balance of the strain gauges thus producing analogue signals representing movement in azimuth or elevation. The directional sense and amplitude of signal depends on the direction and amount moved by the actuator applying strain to the gauges! Micro amplifiers the signals to the analogue level required at the computer complex.


Relay and power supply:
When+28V DC is applied at pin D:
RLA becomes energized, closing contacts:
RLA1 and 2 to clamp analogue signal pins T and U at a reference 0 volt potential.
Note: These contacts prevent unintentional switching of the digital output signal when +28V DC
is not present.
RLB becomes energized, closing contacts:
RLB1 and 2 to connect the micro amplifier outputs to pins T and U.
RLB3 to complete the 115V, 400Hz power supply to the AC To DC convertor
AC to DC convertor:
115V, 400HZ AC Supplied to the AC to DC convertor (Part No: RAC03-05SE/277) through RLB Relay. The AC to DC convertor converts 115V AC, 400 Hz to +12V DC& -12V DC using 2 AC to DC Convertor Module.


AC to DC Convertor Output approximately ±12V DC provides a power source for the Strain
gauge, offset potentiometers. This voltage is reduced to approximately +5V DC at the junction
ofDlandRll.
AC to DC Convertor Output approximately ±12V DC provides a power source to the Servo
Amplifier section gives output of ±5V DC.
Tension applied to the thumb control button is transferred via the ball actuator to the affected
strain gauge, producing a corresponding resistance change. Two pairs of strain gauges are
mounted in a bridge configuration, each pair being connected to the +5V DC supply and
reference 0 volt line. ^ . -
Strain applied to any gauge, causes a rise or fall in potential at the appropriate junction, i.e. a
strain at Gl causes a proportional fall at the junction G1/G2, while a strain at G2 causes a
proportional rise. Similarly strains applied to G3 and G4 cause corresponding changes in
potential at junction G3/G4.
Junction G1/G2 and G3/G4 are connected to inverting input 2 of Ul and U2 respectively. Both
amplifiers are of a linear high gain type. Pin 3 of each amplifier is connected to the wiper of
potentiometer (R14 and R12). Adjusting the potentiometers provides the amplifiers with signals
to offset the design level potentials at the strain gauge junctions. This ensures that, with no

tension applied to the junction potential (depending on which gauge is operated) produces
polarity sensitive amplifier outputs.
Both micro amplifiers have input and output frequency compensating C/R components.
Amplifier gain is set to the required level by adjusting potentiometers R5 or R22. Resistors RIO,
R16 and R19, R21 scale the analogue outputs within the ±5V DC range required at the computer
complex.
Input/ Output Requirements: inputs:
a) 115v, 400hz single phase
b) +28v dc for relay output:

a) Level (Analogue+5V to-5V range).
b) Azimuth (Analogue +5V to -5V range).
Interface & Integration Requirements:
Two connectors fitted on the Hand controller provides the facility to connect the Hand
controller to the Aircraft.
Design Standards:
Hand controller is being indigenized through reverse engineering and item should meet
the Form, Fit and Function requirement.
> Power supply requirement as per MIL-STD-704D.
> EMI/EMC requirement as per MIL-STD-461F.
> Qualification test requirements as per BS-3G-100, MIL-STD-810E and JSS-55555.
> Mechanical material requirements as per MIL-A-8625 REV F.
CLAIMS:
1. The obsolescence issue of original Hand controller of Jaguar Military aircraftwas eliminated.
2. Self reliance and sufficient foreign exchange saving were achieved.
3. Servicing cycle time reduced..