FORM 2 THE PATENTS ACT, 1970
(39 of 1970) & The Patents Rules, 2003
PROVISIONAL/COMPLETE SPECIFICATION
(See section 10 and rule 13)
1. TITLE OF THE INVENTION
Device to simulate and test the fuel management system of
fighter aircraft ,
2. APPLICANT(S)
(a) NAME: HINDUSTAN AERONAUTICS LIMITED
(b) NATIONALITY: INDIAN
(c) ADDRESS: SM(PP-SUROH), Aircraft Overhaul Division, Nasik
3. PREAMBLE TO THE DESCRIPTION
PROVISIONAL The following COMPLETE The following specification
specification describes the particularly describes the invention and
invention. the manner in which is to be performed.
x v
4. DESCRIPTION (Description shall start from next stage.) Refer Annexure I
5. CLAIMS (Not applicable for provisional specification. Claims should start with the preamble - "I/We claim" on separate page)
Refer Annexure II
6. DATE AND SIGNATURE (to be given at the end of last page of specification)
7. ABSTRACT OF THE INVENTION (to be given along with complete specification on separate page)
Refer Annexure III
Note:-
*Repeat boxes in case of more than one entry.
*To be signed by the applicant(s) or by authorized registered patent agent.
*Name of the applicant should be given in full, family name in the
beginning.
*Complete address of the applicant should be given stating the postal index
no./code, state and country.
I *Strike out the column(s) which is/are not applicable.
5

1 Title of the Invention
Device to Simulate and Test the Fuel Management System of Fighter Aircraft
2 Field of the Invention
The invention relates to electrical, mechanical and aerospace engineering in general and the specifically to fighter aircraft repair.
3 Background of the Invention
Fuel management systems enable fuel to be loaded, stored, managed and delivered to the engine at all flight altitude and flight condition of a fighter aircraft. Fuel is commonly pumped to fuel tanks through fuel tankers on ground. Multiple fuelling valves and fuel quantity transmitter are used in an advance complex fuel management system of fighter aircraft. Fuel management systems majorly perform:
Regulating the fuel flow and indicate the available quantity of fuel on different tanks of fighter aircraft as per the fuel tank capacity and sequencing of fuelling on different tanks on an aircraft during refueling and de-fueling on ground and in air.
Regulate the sequencing of refueling and de-fuelling on different tanks of aircraft during engine operation, dumping of fuel and transfer of fuel. Calculate fuel flow/time ratio and also transmit signals to an indicator for the presence of total fuel available in tanks for consumption during flight mode and on ground.
Provide continuous signal and critical warning in case of abnormal fuel management during flight mode and on ground to various systems. Integral and interconnected fuel tanks are used to store the fuel and accurate measurement of the fuel quantity is a crucial and critical requirement of fuel content and quantity indication system of fighter aircraft. The measurement of rate at which the fuel flows to the engine enables an aircraft to be flown at maximum efficiency as per specified operating conditions. Both these measurements enable the pilot to assess remaining

flight time as per the current/optimal rating of the engines. The fuel quantity and indication system in fighter aircraft provides more accurate and attitude error free readings to various computer and system of aircraft.
Electrically operated fuel quantity transmitters are install inside the fuel tank. It is used to convert the fuel level into a discrete electrical signal, when predetermined fuel level is reached in the respective tanks for fuel content and quantity indication system. Number of fuel quantity transmitters is based on the design and quantity fuel tanks on the fighter aircraft. In case any fuel abnormality detected by fuel management systems fuel quantity transmitters are to be removed from aircraft and individually tested at testing facility. Based on the analysis reports of fuel management systems and transmitters for any abnormality, rectification was done and it is a tedious, time consuming and resource intensive process.
The present invention deals with the innovative design of portable device to simulate and test the advance complex fuel management system of fighter aircraft in a simple, less time consuming and with highly safer mode with any fuel condition of aircraft.
3.1 Prior Art
European patent EP 3020941: Aircraft fuel system, describes the general
design aspect of aircraft fuel systems and delivery of fuel by complex fuel
management system inside the aircraft. Though it is related to an aircraft
fuel system, it does not related to the present invention either on the scope
or on the functionality.
US patent US 10822119: Fuelling arrangement and method, describes a
method of fuelling an aircraft for a flight to a predetermined destination and
the general design aspect of aircraft fuel systems. Though it is related to an
aircraft fuel system, it does not related to the present invention either on the
scope or on the functionality
US patent US 8844583: Refuel valve assembly and method for refuelling
an aircraft, is about refuelling valve assembly for refuelling an aircraft with

two or more tanks. It does not deal with control of valves during installation on fighter aircraft and also testing of valve on aircraft.
4 Brief Summary of the Invention
The present invention is portable device use for simulation of electrically operated fuel quantity transmitter's signals and to test the electrical parameter generated by the complex fuel management system for fuel quantity transmitter's of fighter aircraft.
Multiple integral and interconnected fuel tanks are used to store the fuel and accurate measurement of the fuel quantity is a crucial and critical requirement of fuel content and quantity indication system of fighter aircraft. Electrically operated fuel quantity transmitters are install at various positions inside the fuel tank. It is used to convert the fuel level into a discrete electrical signal, when predetermined fuel level is reached in the respective tanks. Electrically operated fuel quantity transmitters provides more accurate and attitude error free readings to various computer and system of aircraft. Number of fuel quantity transmitters is based on the design and quantity fuel tanks on the fighter aircraft.
Advance complex fuel management systems enable fuel to be loaded, stored, managed, dumped and delivered to the engine at all flight altitude and flight condition of a fighter aircraft. The amount of fuel transferred to main fuel is at a definite sequence to ensure aircraft center of gravity shift is within the prescribed limits in the longitudinal axis. In case of any failure of fuel quantity transmitter's abnormal fuel management signal is generated by fuel management systems at all conditions.
5 Detail Description of the Drawings
The invention can be better understood by reading the detail description of the disclosed embodiment followed by the accompanied drawings: Figure 1: Schematic diagram of device to simulate and test the fuel management system of fighter aircraft.

Figure-2: Block diagram of device to simulate and test the fuel management system of fighter aircraft. Details of figure 1 & 2
1: Connecting Element-1
2: Connecting Element-2
3: Indicating Element-1 for tank 1
4: Measuring element-1 for tank 1
5: Simulating element-1 for tank 1
6: Indicating Element-2 for tank 2
7: Measuring element-2 for tank 2
8: Simulating element-2 for tank 2
9: Indicating Element-3 for tank 3
10: Measuring element-3 for tank 3
11: Simulating element-3 for tank 3
12: Indicating Element-4 for tank 4
13: Measuring element-4 for tank 4
14: Simulating element-4 for tank 4
15: Indicating Element-5 for tank 5
16: Measuring element-5 for tank 5
17: Simulating element-5 for tank 5
18: Sealing
19: Electrical insulating casing
20: Device to simulate and test the fuel management system
6 Detail Description of the Invention
Multiple integral and interconnected fuel tanks are used to store the fuel in fighter aircraft. Fuel tanks are located at various location based on design and shape of aircraft. Electrically operated multiple fuel quantity transmitters are install at various positions inside the fuel tanks. In case of any failure of fuel quantity transmitter's abnormal fuel management signal is generated by fuel management systems of fighter aircraft.

Present invention is a device to simulate and test the fuel management system of fighter aircraft with five integral and interconnected fuel tanks.
A full understanding of the invention can be gained, when wherein parts are referred by the numerals read in conjunction with; Figure 1: Schematic diagram of device to simulate and test the fuel management system of fighter aircraft.
Figure-2: Block diagram of device to simulate and test the fuel management system of fighter aircraft.
Device to simulate and test the fuel management system (20) made of electrical insulating material casing (19) for simulation of electrically operated fuel quantity transmitter's signals and to test the electrical parameter generated by the complex fuel management system for fuel quantity transmitters. Connecting element (1) is used to connect the device to interface of fuel management system of aircraft with the device (20). Connecting element (2) is a connecting loom for safer distance operation of device (20).
Indicating element-1 (3) comprises of multiple LED for indicating the presence of signals for fuel tank 1 by fuel management system after ensuring the presence of light signal, voltage is checked at measuring element-1 (4). After ensuring the satisfactory voltage level, simulating element-1 (5) of tank 1 is used for generating the fuel transmitters signal of tankl.
Indicating element-2 (6) comprises of multiple LED for indicating the presence of signals for fuel tank 2 by fuel management system after ensuring the presence of light signal, voltage is checked at measuring element-2 (7). After ensuring the satisfactory voltage level, simulating element-2 (8) of tank 2 is used for generating the fuel transmitters signal of tank 2.
Indicating element-3 (9) comprises of multiple LED for indicating the presence of signals for fuel tank 3 by fuel management system after

ensuring the presence of light signal, voltage is checked at measuring element-3 (10). After ensuring the satisfactory voltage level, simulating element-3 (11) of tank 3 is used for generating the fuel transmitters signal of tank 3.
Indicating element-4 (12) comprises of multiple LED for indicating the presence of signals for fuel tank 4 by fuel management system after ensuring the presence of light signal, voltage is checked at measuring element-4 (13). After ensuring the satisfactory voltage level, simulating element-4 (14) of tank 4 is used for generating the fuel transmitters signal of tank 4.
Indicating element-5 (15) comprises of multiple LED for indicating the presence of signals for fuel tank 5 by fuel management system after ensuring the presence of light signal, voltage is checked at measuring element-5 (16). After ensuring the satisfactory voltage level, simulating element-5 (17) of tank 5 is used for generating the fuel transmitters signal of tank 5.
All the electrical elements are connected through electrical wire as per figure No. 1 and 2. Sealing material (18) used for sealing the portable device (20) which make it safer to operate. The sealed portable device (20) simulate the fuel transmitters condition of all five tank without removing the fuel transmitters form the aircraft tanks.

7. Drawings

Figure 1

Figure-2

Claims
We Claim,
1. A device (20) to simulate and test the fuel management system on
fighter aircraft comprising;
Connecting element-1 (1) and connecting element-2 (2) use for
connecting the fuel system of aircraft with sealed portable device;
Indicating element (3), (6), (9), (12) and (15) for indicating the
presence of signal generated by fuel management system for fuel
transmitters;
Measuring element (4), (7), (10), (13) and (16) for measuring the
circuit voltage under test; and
Simulating device (5), (8), (11), (14) and (17) for simulating the
condition of fuel transmitter for fuel management system on the
device (20).
2. The device (20) claimed in Claim-1, sealing element (18) is used for sealing the device (20) improve the safety condition.
3. Sealed portable device (20) claimed in Claim-1, made of electrical insulating material (19) improve the safety condition and portable to operate.
4. A device (20) simulate and test the fuel management system of fighter aircraft as claimed in Claim-1, 2 and 3 without removing the fuel transmitters form fighter aircraft for fuel management system.