LEAK DETECTION - DESCRIPTION AND OPERATION 1. General R ...€¦ · LEAK DETECTION - DESCRIPTION AND OPERATION _ 1. General _ R **ON A/C 001-099, 201-249, 251-299, 401-499,

LEAK DETECTION - DESCRIPTION AND OPERATION __________________________________________

1. General _______

R **ON A/C 001-099, 201-249, 251-299, 401-499,

(Ref. Fig. 001)

**ON A/C 101-199,

(Ref. Fig. 001A)

**ON A/C ALL

This continuous monitoring system is designed to detect, by means of detection loops, any ambient overheat. This is to protect the structures and components near the hot air ducts in the fuselage, pylons and wings, against possible leaks or bursts.

2. Component Location __________________ (Ref. Fig. 002)

R **ON A/C 001-099, 201-220, 251-299,

(Ref. Fig. 003)

**ON A/C 101-199,

(Ref. Fig. 003A)

R **ON A/C 221-249,

(Ref. Fig. 003B)

**ON A/C 401-499,

(Ref. Fig. 003C)

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Leak Detection Loops - General Schematic Figure 001

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Leak Detection Loops - General Schematic Figure 001A

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Sensing Element Typical Figure 002


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Component Location Figure 003 (SHEET 1)

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Component Location Figure 003 (SHEET 2)

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INTENTIONALLY BLANK

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Component Location Figure 003A

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Component Location Figure 003B (SHEET 1)

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R Component LocationR Figure 003C (SHEET 1)

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R Component LocationR Figure 003C (SHEET 2)

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**ON A/C ALL

A. Wing Section

R **ON A/C 001-099, 201-220, 251-299,

(Ref. Fig. 003)

**ON A/C 101-199,

(Ref. Fig. 003A)

R **ON A/C 221-249,

(Ref. Fig. 003B)

**ON A/C 401-499,

(Ref. Fig. 003C)

**ON A/C ALL

(Ref. Fig. 004)

------------------------------------------------------------------------------- FIN | FUNCTIONAL DESIGNATION | PANEL|ZONE|ACCESS | ATA | | | | DOOR | REF. ------------------------------------------------------------------------------- 21HF CABLE-CONNECTING, L WING LOOP A 521 521EB 36-22-16 22HF SNSG ELEM-OVHT, L WING LOOP A 521 521EB 36-22-16 23HF SNSG ELEM-OVHT, L WING LOOP A 522 521AT 36-22-16 24HF CABLE-CONNECTING, L WING LOOP A 522 521AT 36-22-16 25HF CABLE-CONNECTING, L WING LOOP A 522 522AB 36-22-16 26HF SNSG ELEM-OVHT, L WING LOOP A 522 522AB 36-22-16 27HF SNSG ELEM-OVHT, L WING LOOP A 522 521AT 36-22-16 28HF SNSG ELEM-OVHT, L WING LOOP A 521 521EB 36-22-16 29HF SNSG ELEM-OVHT, L WING LOOP A 521 521EB 36-22-16 49HF SNSG ELEM-OVHT, L WING LOOP B 521 521EB 36-22-16 50HF SNSG ELEM-OVHT, L WING LOOP B 522 521AT 36-22-16 51HF CABLE-CONNECTING, L WING LOOP B 522 521AT 36-22-16 52HF CABLE-CONNECTING, L WING LOOP B 522 522AB 36-22-16


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Component Location - Wing Figure 004

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------------------------------------------------------------------------------- FIN | FUNCTIONAL DESIGNATION | PANEL|ZONE|ACCESS | ATA | | | | DOOR | REF. ------------------------------------------------------------------------------- 53HF SNSG ELEM-OVHT, L WING LOOP B 522 522AB 36-22-16 54HF SNSG ELEM-OVHT, L WING LOOP B 522 521AT 36-22-16 55HF SNSG ELEM-OVHT, L WING LOOP B 521 521EB 36-22-16 56HF SNSG ELEM-OVHT, L WING LOOP B 521 521AB 36-22-16 77HF CABLE-CONNECTING, L WING LOOP B 521 521AB 36-22-16 37HF CABLE-CONNECTING, R WING LOOP A 621 621EB 36-22-16 38HF SNSG ELEM-OVHT, R WING LOOP A 621 621EB 36-22-16 39HF SNSG ELEM-OVHT, R WING LOOP A 622 621AT 36-22-16 40HF CABLE-CONNECTING, R WING LOOP A 622 621AT 36-22-16 41HF CABLE-CONNECTING, R WING LOOP A 622 622AB 36-22-16 42HF SNSG ELEM-OVHT, R WING LOOP A 622 622AB 36-22-16 43HF SNSG ELEM-OVHT, R WING LOOP A 622 621AT 36-22-16 44HF SNSG ELEM-OVHT, R WING LOOP A 621 621EB 36-22-16 45HF SNSG ELEM-OVHT, R WING LOOP A 621 621AB 36-22-16 64HF CABLE-CONNECTING, R WING LOOP B 621 621EB 36-22-16 65HF SNSG ELEM-OVHT, R WING LOOP B 621 621EB 36-22-16 66HF SNSG ELEM-OVHT, R WING LOOP B 622 621AT 36-22-16 67HF CABLE-CONNECTING, R WING LOOP B 622 621AT 36-22-16 68HF CABLE-CONNECTING, R WING LOOP B 622 622AB 36-22-16 69HF SNSG ELEM-OVHT, R WING LOOP B 622 622AB 36-22-16 70HF SNSG ELEM-OVHT, R WING LOOP B 622 621AT 36-22-16 71HF SNSG ELEM-OVHT, R WING LOOP B 621 621EB 36-22-16 72HF SNSG ELEM-OVHT, R WING LOOP B 621 621AB 36-22-16 80HF SNSG ELEM-OVHT, R WING LOOP A 621 621AT 36-22-16 81HF SNSG ELEM-OVHT, L WING LOOP A 521 521AT 36-22-16 82HF SNSG ELEM-OVHT, R WING LOOP B 621 621AT 36-22-16 83HF SNSG ELEM-OVHT, L WING LOOP B 521 521AT 36-22-16

R **ON A/C 001-099, 101-199, 201-220, 251-299,

B. MID Fuselage Section

R **ON A/C 001-099, 201-220, 251-299,

(Ref. Fig. 003)

**ON A/C 101-199,

(Ref. Fig. 003A)


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**ON A/C 001-099,

(Ref. Fig. 005)

R **ON A/C 101-199, 201-220, 251-299,

(Ref. Fig. 005A)

R **ON A/C 001-099, 101-199, 201-220, 251-299,

------------------------------------------------------------------------------- FIN | FUNCTIONAL DESIGNATION | PANEL|ZONE|ACCESS | ATA | | | | DOOR | REF. ------------------------------------------------------------------------------- 30HF CABLE ASSY 150 36-22-18 31HF OVHT SENS ELEMENT 140 36-22-18 32HF OVERHEAT SENSING ELEM 140 36-22-18 33HF OVHT SENS ELEMENT 140 36-22-18 34HF OVHT SENS ELEMENT 140 147FB 36-22-18 35HF OVHT SENS ELEMENT 140 147FB 36-22-18 36HF OVHT SENS ELEMENT 140 147FB 36-22-18 47HF ELEMENT-OVERHEAT SENSING 140 36-22-18 48HF CABLE ASSY 190 192EB 36-22-00 57HF CABLE ASSY 150 36-22-18 58HF OVHT SENS ELEMENT 140 36-22-18 59HF OVERHEAT SENSING ELEM 140 36-22-18 60HF OVHT SENS ELEMENT 140 36-22-18 61HF OVHT SENS ELEMENT 140 147FB 36-22-18 62HF OVHT SENS ELEMENT 140 36-22-18 63HF OVHT SENS ELEMENT 140 36-22-18 73HF OVHT SENS ELEMENT 140 191EB 36-22-18 74HF OVHT SENS ELEMENT 140 192EB 36-22-18 75HF OVHT SENS ELEMENT 140 36-22-18 76HF CABLE ASSY 190 192EB 36-22-00 78HF OVHT SENS ELEMENT 140 36-22-18 79HF OVHT SENS ELEMENT 140 192EB 36-22-18

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Component Location - Lower MID Fuselage Figure 005

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Component Location - Lower MID Fuselage Figure 005A

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R **ON A/C 221-249, 401-499,

B. MID Fuselage Section

R **ON A/C 221-249,

(Ref. Fig. 003B)

**ON A/C 401-499,

(Ref. Fig. 003C, 005)

R **ON A/C 221-249,

(Ref. Fig. 005A)

R **ON A/C 221-249, 401-499,

------------------------------------------------------------------------------- FIN | FUNCTIONAL DESIGNATION | PANEL|ZONE|ACCESS | ATA | | | | DOOR | REF. ------------------------------------------------------------------------------- 30HF CABLE ASSY 150 36-22-18 31HF OVHT SENS ELEMENT 140 36-22-18 32HF OVERHEAT SENSING ELEM 140 36-22-18 33HF OVHT SENS ELEMENT 140 36-22-18 34HF OVHT SENS ELEMENT 140 147FB 36-22-18 35HF OVHT SENS ELEMENT 140 147FB 36-22-18 36HF OVHT SENS ELEMENT 140 147FB 36-22-18 47HF ELEMENT-OVERHEAT SENSING 140 36-22-18 48HF CABLE ASSY 190 192EB 36-22-00 57HF CABLE ASSY 150 36-22-18 58HF OVHT SENS ELEMENT 140 36-22-18 59HF OVERHEAT SENSING ELEM 140 36-22-18 60HF OVHT SENS ELEMENT 140 36-22-18 61HF OVHT SENS ELEMENT 140 147FB 36-22-18 62HF OVHT SENS ELEMENT 140 36-22-18 63HF OVHT SENS ELEMENT 140 36-22-18 73HF OVHT SENS ELEMENT 140 191EB 36-22-18 74HF OVHT SENS ELEMENT 140 192EB 36-22-18 75HF OVHT SENS ELEMENT 140 36-22-18 76HF CABLE ASSY 190 192EB 36-22-00

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------------------------------------------------------------------------------- FIN | FUNCTIONAL DESIGNATION | PANEL|ZONE|ACCESS | ATA | | | | DOOR | REF. ------------------------------------------------------------------------------- 78HF OVHT SENS ELEMENT 140 36-22-18 79HF OVHT SENS ELEMENT 140 192EB 36-22-18 90HF INTERCONNECTING CABLE 140 36-22-00 91HF INTERCONNECTING CABLE 140 36-22-00 92HF INTERCONNECTING CABLE 140 36-22-00 93HF INTERCONNECTING CABLE 140 36-22-00

R **ON A/C 001-099, 201-249, 251-299,

C. MID and AFT Fuselage Section

R **ON A/C 001-099, 201-220, 251-299,

(Ref. Fig. 003)

R **ON A/C 221-249,

(Ref. Fig. 003B)

**ON A/C 001-099,

(Ref. Fig. 006)

R **ON A/C 201-249, 251-299,

(Ref. Fig. 006B)

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Component Location - Lower MID and AFT Fuselage Figure 006

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Component Location - Lower MID and AFT Fuselage Figure 006A

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Component Location - Lower MID and AFT Fuselage Figure 006B

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R **ON A/C 001-099, 201-249, 251-299,

------------------------------------------------------------------------------- FIN | FUNCTIONAL DESIGNATION | PANEL|ZONE|ACCESS | ATA | | | | DOOR | REF. ------------------------------------------------------------------------------- 11HF CONNECTING CABLE 151 36-22-17 12HF OVHT SENS ELEMENT 151 36-22-17 13HF OVHT SENS ELEMENT 151 36-22-17 14HF OVHT SENS ELEMENT 151 36-22-17 15HF OVHT SENS ELEMENT 161 36-22-17 16HF OVHT SENS ELEMENT 171 36-22-17 17HF OVHT SENS ELEMENT 171 36-22-17 18HF OVHT SENS ELEMENT 311 312AR 36-22-17 19HF OVHT SENS ELEMENT 311 312AR 36-22-17 20HF CABLE ASSY 311 312AR 36-22-17

**ON A/C 101-199,

C. MID and AFT Fuselage Section (Ref. Fig. 003A, 006A)

------------------------------------------------------------------------------- FIN | FUNCTIONAL DESIGNATION | PANEL|ZONE|ACCESS | ATA | | | | DOOR | REF. ------------------------------------------------------------------------------- 11HF CONNECTING CABLE 151 36-22-17 12HF OVHT SENS ELEMENT 151 36-22-17 84HF OVERHEAT SENSING ELEM 150 36-22-17 13HF OVHT SENS ELEMENT 151 36-22-17 14HF OVHT SENS ELEMENT 151 36-22-17 15HF OVHT SENS ELEMENT 161 36-22-17 16HF OVHT SENS ELEMENT 171 36-22-17 17HF OVHT SENS ELEMENT 171 36-22-17 18HF OVHT SENS ELEMENT 311 312AR 36-22-17 19HF OVHT SENS ELEMENT 311 312AR 36-22-17 20HF CABLE ASSY 311 312AR 36-22-17

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**ON A/C 401-499,

C. MID and AFT Fuselage Section (Ref. Fig. 003C, 006C)

------------------------------------------------------------------------------- FIN | FUNCTIONAL DESIGNATION | PANEL|ZONE|ACCESS | ATA | | | | DOOR | REF. ------------------------------------------------------------------------------- 11HF CONNECTING CABLE 151 36-22-17 12HF OVHT SENS ELEMENT 151 36-22-17 84HF OVERHEAT SENSING ELEM 150 36-22-17 14HF OVHT SENS ELEMENT 151 36-22-17 15HF OVHT SENS ELEMENT 161 36-22-17 16HF OVHT SENS ELEMENT 171 36-22-17 17HF OVHT SENS ELEMENT 171 36-22-17 18HF OVHT SENS ELEMENT 311 312AR 36-22-17 19HF OVHT SENS ELEMENT 311 312AR 36-22-17 20HF CABLE ASSY 311 312AR 36-22-17

R **ON A/C 001-099, 101-199, 201-249, 251-299,

D. Pylon Section

**ON A/C 001-099, 201-220, 251-299,

(Ref. Fig. 003)

**ON A/C 101-199,

(Ref. Fig. 003A)

**ON A/C 221-249,

(Ref. Fig. 003B)R

**ON A/C 001-099, 101-199, 201-249, 251-299,

(Ref. Fig. 007)R

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R Component Location - Lower MID and AFT FuselageR Figure 006C

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Component Location - Pylon Figure 007

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------------------------------------------------------------------------------- FIN | FUNCTIONAL DESIGNATION | PANEL|ZONE|ACCESS | ATA | | | | DOOR | REF. ------------------------------------------------------------------------------- 1HF1 SNSG ELEM-OVHT, ENG 1 PYLON 413 414FR 36-22-15 1HF2 SNSG ELEM-OVHT, ENG 2 PYLON 424 423FL 36-22-15 2HF1 CABLE-CONNECTING, ENG 1 PYLON 413 414FR 36-22-00 2HF2 CABLE-CONNECTING, ENG 2 PYLON 424 423FL 36-22-00 3HF1 CABLE ASSY 413 413FR 36-22-00 3HF2 CABLE ASSY 424 423FL 36-22-00

R **ON A/C 401-499,

R D. Pylon SectionR (Ref. Fig. 003C, 007A)

R -------------------------------------------------------------------------------R FIN | FUNCTIONAL DESIGNATION | PANEL|ZONE|ACCESS | ATAR | | | | DOOR | REF.R -------------------------------------------------------------------------------R 1HF1 SNSG ELEM-OVHT, ENG 1 PYLON 413 471AR 36-22-15R 1HF2 SNSG ELEM-OVHT, ENG 2 PYLON 424 481AL 36-22-15R 2HF1 CABLE-CONNECTING, ENG 1 PYLON 413 471AR 36-22-00R 2HF2 CABLE-CONNECTING, ENG 2 PYLON 424 481AL 36-22-00R 3HF1 CABLE ASSY 413 413FR 36-22-00R 3HF2 CABLE ASSY 424 481AL 36-22-00

R **ON A/C ALL

3. System Description __________________

**ON A/C 001-099, 201-249, 251-299, 401-499,

(Ref. Fig. 001)

**ON A/C 101-199,

(Ref. Fig. 001A)

**ON A/C ALL

The aircraft leak detection system is divided into LH and RH zones by the crossfeed valve in the crossfeed duct at STA1537 (FR35). Each leak detection system operates independently. Both wing/fuselage leak detection systems are made up of twin loops (A and B) of overheat sensing elements. This eliminates the possibility of incorrect warnings, due to an AND logic.

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R Component Location - PylonR Figure 007A

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The overheat sensing elements are installed in each wing along the forward face of the front spar. Clamps and rubber grommets attach the overheat sensing elements at regular intervals along the whole length. In the fuselage, the elements are installed at STA1537 (FR35) and close to the crossover bleed-air duct. They continue (LH side elements only) up to the APU check valve on the pressurized fuselage between STA2189 and STA2243. A single loop system is installed along the bleed air duct between the APU check valve and the APU bleed valve. In each of the pylons, there is a single loop. Each loop is located near the pylon ventilation duct.

4. Component Description _____________________ (Ref. Fig. 002) The overheat sensing elements have a solid nickel center conductor set in a ceramic insulation of porous aluminum oxide. An inconel tube contains these components and is sealed at both ends. Eutectic salt fills the space between the tubing, the ceramic insulation and the center conductor. This mixture is compounded to give a signal at alarm temperature. For the wing and fuselage, the alarm temperature is 124 plus or minus 7 deg.C. The pylon alarm temperature quantity is 204 plus or minus 12 deg.C. The impedance between the conductor and the outer tubing decreases suddenly when the alarm temperature is reached. At this temperature, the center conductor grounds and gives an alarm signal.

5. Operation _________

R **ON A/C 001-099, 101-199, 201-249, 251-299,

(Ref. Fig. 007)

**ON A/C 401-499,

(Ref. Fig. 007A)

R **ON A/C 001-099, 201-249, 251-299,

(Ref. Fig. 008)

**ON A/C 101-199,

(Ref. Fig. 008A)


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**ON A/C 401-499,

(Ref. Fig. 008B)

R **ON A/C 001-099, 201-220, 251-299,

(Ref. Fig. 009)

**ON A/C 101-199,

(Ref. Fig. 009A)

R **ON A/C 221-249,

(Ref. Fig. 009B)

**ON A/C 401-499,

(Ref. Fig. 009C)

**ON A/C ALL

(Ref. Fig. 010, 011) The overheat sensing elements continuously monitor the surrounding areas for overheat conditions. They are connected in series and detect overheat conditions at any point along the length of the elements. When only a few inches of the elements are heated to the pre-determined temperature, an alarm is caused. When this occurs, the bleed air supply is shut off automatically. If one loop is inoperative (loop A or B), the remaining loop takes over. If hot air escapes from the bleed air duct and heats an element of the operative loop, a signal is given. The signal causes: - the amber FAULT light on the AIR COND overhead panel to come on, - the activation of the ECAM system. When the ECAM system is activated: - the MASTER CAUT lights on the panels 131VU and 130VU come on amber - a single chime sounds - the message on the upper ECAM display unit comes on - the BLEED page on the lower ECAM display unit comes on.


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Component Location - Cockpit Figure 008

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Component Location - Cockpit Figure 008A

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INTENTIONALLY BLANK

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R Component Location - CockpitR Figure 008B (SHEET 1)

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R Component Location - CockpitR Figure 008B (SHEET 2)

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Leak Detection - Electrical Schematic Figure 009

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Leak Detection - Electrical Schematic Figure 009A

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Leak Detection - Electrical Schematic Figure 009B

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R Leak Detection - Electrical SchematicR Figure 009C

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INTENTIONALLY BLANK

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Leak Detection Logic LH Figure 010

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Leak Detector Logic RH Figure 011

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The FAULT light stays on as long as the overheat condition exists. The valves associated with the loop close automatically. If the overheat condition is eliminated, the circuit must be reset to open the valves. The different FAULT warnings on the AIR COND overhead panel 30VU are: - the FAULT legend on the ENG 1 BLEED pushbutton switch which comes on if there is an overheat condition in the LH zone (LH pylon, LH wing and LH MID fuselage), - the FAULT legend on the ENG 2 BLEED pushbutton switch which comes on if there is an overheat condition in the RH zone (RH pylon, RH wing and RH MID fuselage), - the FAULT legend on the APU BLEED pushbutton switch which comes on if there is an overheat condition in the MID and AFT fuselage (APU duct). At the same time as the FAULT legend on the ENG 1 BLEED pushbutton switch comes on, the following valves close automatically: - the LH pressure regulating valve, - the LH wing anti-icing (if the wing anti-icing system is operative) valve, - the APU bleed valve (the APU pushbutton switch is in the ON position), - the crossbleed valve (the selector is in the AUTO position). When the FAULT legend on the ENG 2 BLEED pushbutton switch comes on, the following valves close automatically: - the RH pressure regulating valve - the RH wing anti-icing valve (if the wing anti-icing system is operative) - the crossbleed valve (the selector is in the AUTO position). When the FAULT legend on the APU BLEED pushbutton switch comes on, the APU bleed valve closes automatically (the APU pushbutton switch is in the ON position). Engine start sequence prevents that the APU bleed valve and the crossbleed valve (the selector is in the AUTO position) close. A functional test can only be carried out on the ground by automatic control activation. It checks the outputs or status of each leak detection loop in-turn. The maintenance test permits the maintenance crew to check a specific function of the system. Additionally, the maintenance test finds a failed Line Replaceable Unit (LRU).

6. Leak (Overheat) Detection _________________________ The two bleed air monitor computers (BMC 1 and BMC 2) monitor the seven detection loops (Loops A and B, LH wing, Loops A and B, RH wing, LH and RH pylon loops and fuselage loop). The indications are given in Chap. 36-20-00.

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Documents

LEAK DETECTION - DESCRIPTION AND OPERATION 1. General R ...€¦ · LEAK DETECTION - DESCRIPTION AND OPERATION _____ 1. General _____ R **ON A/C 001-099, 201-249, 251-299, 401-499,

LEAK DETECTION - DESCRIPTION AND OPERATION 1. General R ...€¦ · LEAK DETECTION - DESCRIPTION AND OPERATION _ 1. General _ R **ON A/C 001-099, 201-249, 251-299, 401-499,