Airspeed Indicator (ASI)                                                                                            
Aircraft Instruments
Airspeed Indicator is an indispensable part of flight display system. It indirectly
measures the indicated airspeed during flight of the aircraft by direct measuring
atmospheric pressure, and display the information to pilot.  

Working principle of the indicated airspeed indicator is based on the difference
between total pressure and static pressure measured at a certain flying altitude. This
pressure difference has functional relation with speed, when it is sensed by pressure
capsule and causes a displacement of the latter, this displacement will be transported
via driving mechanism to indicate on the dial the indicated airspeed.
BK-51 Airspeed Indicator
(Approved by CAAC, No.: TSOA0032-HB-005)

BK-51 meets the requirement of CCAR TSO-C2d
"Technical Standard order, Airspeed Instruments"
and RTCA DO 160C-1989 "Environmental Conditions
and Test Procedures for Airborne Equipment"

Features
Breech loading configuration
High accuracy pressure capsule adopted
Excellent environment adaptiveness
Interior lighting applicable
Small size and light weight
Error-proof design for external interfaces

Technical Performance Date
Airspeed range: 20~160knots
Operating temperature: -20℃~55
instantaneous working high temperature: 70
Storage temperature: -55℃~85
Accuracy: meet AS8019 of TSO-C2D
Interior lighting: white light, 28V DC
Weight: 356g + 32g (installation accessories
not included)
Size: 2-1/4" (W64mm x H64mm x L130mm;
Pitch of location hole: 56mm x 56mm)
BK-7D Airspeed indicator
(Approved by CAAC, No.: TSOA0032-HB-002)

BK-7D meets the requirement of CCAR TSO-C2d
"Technical Standard order, Altimeter" and RTCA DO
160C-1989 "Environmental Conditions and Test
Procedures for Airborne Equipment"

Technical Performance Date
Airspeed range: 20~120mph
Operating temperature: -20℃~55
instantaneous working high temperature: 70
Storage temperature: -55℃~85
Accuracy: meet AS8019 of TSO-C2D
Weight: <=310g
Size: 3-1/8" (D80mm x L84mm;
BK-15B Airspeed indicator
(Approved by CAAC, No.: TSOA0032-HB-002)

BK-15B meets the requirement of CCAR TSO-C2d
"Technical Standard order, Altimeter" and RTCA DO
160C-1989 "Environmental Conditions and Test
Procedures for Airborne Equipment"

Technical Performance Date
Airspeed range: 20~120knots
Operating temperature: -20℃~55
instantaneous working high temperature: 70
Storage temperature: -55℃~85
Accuracy: meet AS8019 of TSO-C2D
Weight: <=410g
Size: 3-1/8" (D80mm x L122mm;
Other Non TSO'd Airspeed Indicator
BK-37                      BK-7B                       BK120-1A
Products List
Model
Measuring Range
Size
Description
BK-3
20~160mph(outside), 20~140kn(inside)
3-1/8"
Dual scales
BK-4
30~180mph(outside), 30~160kn(inside)
3-1/8"
Dual scales
BK-10
30~200mph(outside), 30~180kn(inside)
3-1/8"
Dual scales
BK-5
30~250mph(outside), 30~220kn(inside)
3-1/8"
Dual scales
BK-18
40~300mph(outside), 40~260kn(inside)
3-1/8"
Dual scales
BK-12
20~80kn
3-1/8"
Short case
BK-13A
20~100kn
3-1/8"
Short case, dense scale
BK-14A
20~120kn
3-1/8"
Short case, dense scale
BK-34
30~180kn
3-1/8"
 
BK-5A
30~220kn
3-1/8"
 
Bk-25
40~260kn
3-1/8"
 
BK-9C
20~80mph
3-1/8"
Short case, dense scale
BK-36
20~80mph
2-1/4"
 
BK-8D
20~100mph
3-1/8"
Short case, dense scale
BK-37
20~100mph
2-1/4"
 
BK--7B
20~120mph
3-1/8"
Short case, dense scale
BK-38
20~120mph
2-1/4"
 
BK-31
20~140mph
3-1/8"
 
BK-23
20~140mph
2-1/4"
 
BK-6C
20~150mph
3-1/8"
Short case, dense scale
BK-32
20~160mph
3-1/8"
 
BK-33
30~180mph
3-1/8"
 
BK-35
30~200mph
3-1/8"
 
BK120-1A
31~120kph
2-1/4"
 
BK120-1B
30~120kph
3-1/8"
Short case
BK140
30~140kph
2-1/4"
 
BK150-1A
30~150kph
3-1/8"
Short case
BK200-1A
30~200kph
3-1/8"
Short case
BK240
30~240kph
3-1/8"
Short case
BK300
30~300kph
3-1/8"
Short case
BK350-4
30~350kph
3-1/8"
Short case
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