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ATA 21 Aircraft Systems Parts Catalog - Explore Now

The ATA numbering system, also known as the Air Transport Association (ATA) chapters, is a widely recognized and standardized system used in the aviation industry to document parts, components, and entire commercial aircraft. This system, like many others in the aerospace industry, serves to provide a common understanding for pilots, maintenance technicians, engineers, and others involved in aircraft operations.

The ATA 100 system is divided into several sections, with one of them being the ATA Group. Each group contains specific ATA chapters such as ATA Group – Aircraft Systems, one of which refers specifically to the components listed under ATA Chapter 21. It’s provide important information on aircraft systems such as electrical power, fire protection, fuel, navigation, hydraulic, and more. If you’re in search of ATA Aircraft Systems or other ATA names, Aviation Parts Circuit is your one-stop-shop. We specializes in supplying ATA chapters parts of ATA 21 under ATA Group Aircraft Systems.


Part No Description ATA Number ATA Chapter RFQ
NAS1611-269 o ring epm rubber 21 Air Conditioning RFQ
747-21-2474-0046-2 angle 21 Air Conditioning RFQ
214A2107-61B segment assy 21 Air Conditioning RFQ
464770-014057 isolator 21 Air Conditioning RFQ
BACE21AW0808W elbow 21 Air Conditioning RFQ
214U2129-74 duct 21 Air Conditioning RFQ
417N3002-5 duct instl 21 Air Conditioning RFQ
BACS40R011F026F shim 21 Air Conditioning RFQ
NAS1149CN432R washer ,flat-cres 21 Air Conditioning RFQ
65C31493-179 hose instl 21 Air Conditioning RFQ
821W4243-322 duct assy 21 Air Conditioning RFQ
7001-200 seal 21 Air Conditioning RFQ
217W1009-16 orifice instl 21 Air Conditioning RFQ
821U4326-142 duct 21 Air Conditioning RFQ
214U4007-65 duct instl 21 Air Conditioning RFQ
NSA935504-02 support 21 Air Conditioning RFQ
214W8114-36 hose assy 21 Air Conditioning RFQ
215W1023-22 duct instl 21 Air Conditioning RFQ
083212311-25 flange 21 Air Conditioning RFQ
214U1020-40 duct instl 21 Air Conditioning RFQ
170-19483-401 tube assy 21 Air Conditioning RFQ
JMS1602-6300 bushing 21 Air Conditioning RFQ
214W4012-208 hose instl 21 Air Conditioning RFQ
69B43325-43 connector 21 Air Conditioning RFQ
214U2264-61 clip assy 21 Air Conditioning RFQ
65B48482-101 duct assy 21 Air Conditioning RFQ
BACD40AA12C1070A hoseduct 21 Air Conditioning RFQ
BACG20ZC001275 grommet 21 Air Conditioning RFQ
5416K23 clamp 21 Air Conditioning RFQ
BAC27NEC0027 marker 21 Air Conditioning RFQ
BACC47CP1A contact 21 Air Conditioning RFQ
MS21043-5 nut,hexagon-self locking,cres 21 Air Conditioning RFQ
412N3120-88 grill assy 21 Air Conditioning RFQ
214U2251-91 bracket 21 Air Conditioning RFQ
214U7330-1324 duct assy 21 Air Conditioning RFQ
215U1004-13 sensor assy 21 Air Conditioning RFQ
212W2103-3 cap 21 Air Conditioning RFQ
AS1506-13D32 sleeve 21 Air Conditioning RFQ
AS1544-14A0290 hose 21 Air Conditioning RFQ
60305-820000-01 duct assy 21 Air Conditioning RFQ
411A1110-2039SP grille instl 21 Air Conditioning RFQ
214U2001-164 system instl 21 Air Conditioning RFQ
411N1510-175C grille assy 21 Air Conditioning RFQ
69B41134-1 shim 21 Air Conditioning RFQ
214N2183-11 nozzle assy 21 Air Conditioning RFQ
CD-01046F-2 filter 21 Air Conditioning RFQ
BACC10HU074BE clamp 21 Air Conditioning RFQ
217U1110-9 bracket 21 Air Conditioning RFQ
214U6101-67 duct assy 21 Air Conditioning RFQ
202W1100-3739 duct 21 Air Conditioning RFQ
65-49569-37 duct 21 Air Conditioning RFQ
65C38556-7 panel 21 Air Conditioning RFQ
343-2163020-006 fan assy 21 Air Conditioning RFQ
453U2603-27 nozzle instl 21 Air Conditioning RFQ
2055302 piercer 21 Air Conditioning RFQ
NAS600-8P screw-pan head ,slot cross,steel 21 Air Conditioning RFQ
BCREF51753 bracket assy 21 Air Conditioning RFQ
65B41222-85 tube assy 21 Air Conditioning RFQ
NAS1102E3-11 screw 21 Air Conditioning RFQ
65B43406-38 diffuser assy 21 Air Conditioning RFQ
412N3137-3090SP beam assy 21 Air Conditioning RFQ
65C33279-88 adapter assy 21 Air Conditioning RFQ
214W1501-41 duct 21 Air Conditioning RFQ
213W1001-8 pack instl 21 Air Conditioning RFQ
213U2240-7 bracket assy 21 Air Conditioning RFQ
65B42899-24 manifold assy 21 Air Conditioning RFQ
217W1030-49 duct instl 21 Air Conditioning RFQ
214N2162-2 outlet 21 Air Conditioning RFQ
BACS12GU3K96 screw 21 Air Conditioning RFQ
60191-173004-32 spacer 21 Air Conditioning RFQ
214N2183-13 nozzle assy 21 Air Conditioning RFQ
65C37109-9 bracket assy 21 Air Conditioning RFQ
214W2134-3071 plenum assy 21 Air Conditioning RFQ
AS1591-10-0182A hose 21 Air Conditioning RFQ
BCREF72313 bracket 21 Air Conditioning RFQ
51090248-001 controller assy 21 Air Conditioning RFQ
65B41700-32 support assy 21 Air Conditioning RFQ
1000935-1 nut 21 Air Conditioning RFQ
69494J906 ring, sealing 21 Air Conditioning RFQ
BACC10GE11C clamp 21 Air Conditioning RFQ
WW14X caplug 21 Air Conditioning RFQ
65B09720-22 housing 21 Air Conditioning RFQ
214U1001-24 duct instl 21 Air Conditioning RFQ
412N3131-501 extrusion instl 21 Air Conditioning RFQ
89011515-020 bracket 21 Air Conditioning RFQ
213U3110-1 duct assy 21 Air Conditioning RFQ
60305-820104-01 insulator 21 Air Conditioning RFQ
214W7106-3001 duct assy 21 Air Conditioning RFQ
453U1343-2 bracket 21 Air Conditioning RFQ
215U2102-3 box assy 21 Air Conditioning RFQ
AS1544-06A0280 hose 21 Air Conditioning RFQ
606832-21 valve assy 21 Air Conditioning RFQ
217U2001-9 restrictor instl 21 Air Conditioning RFQ
NH135008-0400 coupling 21 Air Conditioning RFQ
286W6109-008 wire bundle assy 21 Air Conditioning RFQ
BAC27NEC0143 marker 21 Air Conditioning RFQ
BACN11P3A4C nutplate 21 Air Conditioning RFQ
213N1100-100 duct assy 21 Air Conditioning RFQ
821W4222-336 angle assy 21 Air Conditioning RFQ
214N3046-3 duct 21 Air Conditioning RFQ
400A0006-2602 functional collector 21 Air Conditioning RFQ
214U6104-155 bracket 21 Air Conditioning RFQ
65C31493-139 hose instl 21 Air Conditioning RFQ
212A1125-8 tube 21 Air Conditioning RFQ
213A3190-5 support assy 21 Air Conditioning RFQ
286W6109-025 wire bundle assy 21 Air Conditioning RFQ
821W5140-202 duct assy 21 Air Conditioning RFQ
412N3110-281SP outlet assy 21 Air Conditioning RFQ
214W2441-5 side wall 21 Air Conditioning RFQ
215W1160-176 duct assy 21 Air Conditioning RFQ
214N1078-2 duct 21 Air Conditioning RFQ
AS1591-05-0062A duct 21 Air Conditioning RFQ
214U7011-1 duct instl 21 Air Conditioning RFQ
217W1920-134 bracket 21 Air Conditioning RFQ
65C35417-1 bracket assy 21 Air Conditioning RFQ
65B41117-15 duct assy 21 Air Conditioning RFQ
453U2101-18 detector instl 21 Air Conditioning RFQ
287N4095-4 bracket assy 21 Air Conditioning RFQ
214U6002-31 duct instl 21 Air Conditioning RFQ
400A9101-3504 functional collector 21 Air Conditioning RFQ
69-38765-23 hinge half 21 Air Conditioning RFQ
D2122879320200 insulation 21 Air Conditioning RFQ
214N2109-20 duct assy 21 Air Conditioning RFQ
214N2180-125SP duct assy 21 Air Conditioning RFQ
214U3121-40 duct assy 21 Air Conditioning RFQ
BACJ40A20-30 jumper 21 Air Conditioning RFQ
214N1048-1 duct assy 21 Air Conditioning RFQ
214N3002-19 duct instl 21 Air Conditioning RFQ
218W6012-18 equipment instl 21 Air Conditioning RFQ
214N2168-8 bracket assy 21 Air Conditioning RFQ
747-21-2480-0005-1 duct assy 21 Air Conditioning RFQ
170-55794-403 flt deck supply duct 21 Air Conditioning RFQ
69B43341-1 bracket 21 Air Conditioning RFQ
MS24264R16B24SN receptac 21 Air Conditioning RFQ
214N2109-73 duct assy 21 Air Conditioning RFQ
MS21042-06 nut, self-lkg, hex, reduced 21 Air Conditioning RFQ
214U4107-81 duct assy 21 Air Conditioning RFQ
MFM68415F550 flange 21 Air Conditioning RFQ
214W8114-2313 hose assy 21 Air Conditioning RFQ
215W3001-1 duct instl 21 Air Conditioning RFQ
AS1504-16B0200 hoseduct 21 Air Conditioning RFQ
821A4250-2 duct assy 21 Air Conditioning RFQ
214U2284-9 mounting assy 21 Air Conditioning RFQ
22502-16 packing 21 Air Conditioning RFQ
412N3110-229SP outlet assy 21 Air Conditioning RFQ
214N4002-200 hose instl 21 Air Conditioning RFQ
214U2172-64 duct assy 21 Air Conditioning RFQ
BCREF81181 bracket assy 21 Air Conditioning RFQ
214A2015-19 hose assy 21 Air Conditioning RFQ
214N2126-30 adaptor assy 21 Air Conditioning RFQ
D2121083300500 duct (rh) 21 Air Conditioning RFQ
NAS1351N4-32 screw 21 Air Conditioning RFQ
214N2520-200 diffuser assy 21 Air Conditioning RFQ
BCREF151153 hose 21 Air Conditioning RFQ
171-41148-401 lavatory kit fwd lh vacuum 21 Air Conditioning RFQ
214W7108-3030 duct assy 21 Air Conditioning RFQ
BE725-12-142-5 hose 21 Air Conditioning RFQ
214U5001-15 equipment instl 21 Air Conditioning RFQ
213N1017-10 tube 21 Air Conditioning RFQ
BACW10EG5J washer 21 Air Conditioning RFQ
214W8115-110 hose assy 21 Air Conditioning RFQ
C22102-949-101 spacer 21 Air Conditioning RFQ
214A2107-122B duct segment assy 21 Air Conditioning RFQ
69B70478-1 zee 21 Air Conditioning RFQ
801352-009 circuit 21 Air Conditioning RFQ
214T3436-772 orifice assy 21 Air Conditioning RFQ
821W4241-341 insulation 21 Air Conditioning RFQ
214N2115-6 duct assy 21 Air Conditioning RFQ
214U2008-16 duct instl 21 Air Conditioning RFQ
AS1581T12 sleeve 21 Air Conditioning RFQ
747-21-2477-0010-2 duct assy 21 Air Conditioning RFQ
BACD40AC07B30 sleeve 21 Air Conditioning RFQ
69-38772-9 seal 21 Air Conditioning RFQ
65C25660-123 nozzle assy 21 Air Conditioning RFQ
0YV0030A07G01 cover 21 Air Conditioning RFQ
65C33279-1 adapter assy 21 Air Conditioning RFQ
BACD40A36-006-6A12 duct 21 Air Conditioning RFQ
69-55226-40 bracket assy 21 Air Conditioning RFQ
BACD40AA06C0200B hoseduct 21 Air Conditioning RFQ
214W1501-3034 duct assy 21 Air Conditioning RFQ
398906-1 valve assy 21 Air Conditioning RFQ
65B40015-27 separator instl 21 Air Conditioning RFQ
284A0012-2025 functional collector 21 Air Conditioning RFQ
214N2177-400 duct assy 21 Air Conditioning RFQ
214U3008-120 orifice instl 21 Air Conditioning RFQ
0YV2070A17G01 duct 21 Air Conditioning RFQ
217A1006-1 duct instl 21 Air Conditioning RFQ
AS1544-07A0670 hose 21 Air Conditioning RFQ
B0E2455160088E0 duct 21 Air Conditioning RFQ
214W5111-2 intercostal assy 21 Air Conditioning RFQ
214W2414-33 bracket 21 Air Conditioning RFQ
NAS463FDD416L spacer 21 Air Conditioning RFQ
0FC2160A02M01 spacer 21 Air Conditioning RFQ
65B41100-65 header 21 Air Conditioning RFQ
214U1147-92 bracket assy 21 Air Conditioning RFQ
213N1104-8 bracket assy 21 Air Conditioning RFQ
B0040620-3 outlet 21 Air Conditioning RFQ
65-55348-19 vane 21 Air Conditioning RFQ
732010-5 washer 21 Air Conditioning RFQ
018608-01 sensor 21 Air Conditioning RFQ
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