20NKBN-25-TD-U3 aircraft battery,used for onboard DC systems20NKBN-25-TD-U3 is an aviation nickel cadmium battery used in airborne 24V DC power systems.It is mainly used for autonomous engine start-up,auxiliary power unit(APU)start-up,emergency power supply,and ground operations when the mai

　　20NKBN-25-TD-U3 aircraft battery,used for onboard DC systems

　　20NKBN-25-TD-U3 is an aviation nickel cadmium battery used in airborne 24V DC power systems.It is mainly used for autonomous engine start-up,auxiliary power unit(APU)start-up,emergency power supply,and ground operations when the main power source is unavailable.This battery,as part of the aircraft's DC power network,works in conjunction with battery contactors,protective devices,charging circuits,busbars,and cockpit indicators.It is not a converter or voltage regulator.Its function is to store electrical energy and provide high current when needed by the aircraft system.

　　Start up and emergency power supply through 20NKBN-25-TD-U3

　　During operation,the battery can provide high current for starting the file reading and support selected DC powered devices in emergency mode.This is particularly important before the generator goes online or when the external power source is not connected.According to the electrical design of the aircraft,the battery can be used to start the main engine or auxiliary power unit.The actual starting ability depends not only on the battery type,but also on the charging status,temperature,wiring resistance,contactor status,and the reading of the connection to the DC bus.

　　Marking Structure of 20NKBN-25-TD-U3 Battery

　　This model identifies the basic type of battery.20"represents the number of battery cells connected in series.NK"represents the nickel cadmium electrochemical system.B"represents the battery,and"N"represents the paste electrode design.25"represents the rated capacity level.TD"indicates that the battery contains a thermal sensor for overheating indication.U3"represents the climate version.This marking is crucial in the procurement process,as similar aviation batteries may have the same voltage level but differ in capacity,thermal control,size,or operational limitations.

　　Aircraft application of 20NKBN-25-TD-U3 battery

　　20NKBN-25-TD-U3 is used for aircraft and helicopters specified in the electrical system documentation to use this battery type.Typical applications include An-74、An-140、Il-62、Il-76、Il-86、Il-96、Tu-154、Tu-204、Mi-8MTV、Mi-171 Configure with Ka-32.The specific installation should still be verified through the aircraft documentation,as the layout of the battery compartment,connector arrangement,charging system settings,and thermal indicator wiring may vary depending on the aircraft model,production series,or modification standards.

　　Identification and ordering inspection of 20NKBN-25-TD-U3

　　Before placing an order,the installed battery model should be compared with the aircraft parts catalog,battery compartment documentation,or maintenance records.To ensure accurate ordering,it is recommended to specify the aircraft model,required battery status,documentation,electrolyte status,and whether it is suitable for tropical or temperate climate requirements.If the aircraft wiring includes battery temperature indication function,the thermal sensor version should also be confirmed.This product is also known as the backup model 20НКБН-25-ТДУ3.

　　Product type:Aircraft nickel cadmium battery

　　Function:Autonomous engine/auxiliary power unit startup,emergency and ground DC power supply

　　Application/Field of Use:Aircraft and Helicopter Onboard DC Electrical Systems

　　System/Installation Area:Battery compartment/24 V DC onboard network

　　Compatible with aircraft/equipment:An-74、An-140、Il-62、Il-76、Il-86、Il-96、Tu-154、Tu-204、Mi-8MTV、Mi-171、Ka-32，According to the aircraft documents

　　Battery type:Ventura nickel cadmium aviation battery

　　Number of batteries:20

　　Rated voltage:24.0 V

　　Rated capacity:25.0 Ah

　　Continuous discharge current:up to 250 A

　　Start reading and discharge current amplitude:up to 650 A

　　Charge discharge characteristic temperature range:-20 to+50°C

　　Operating temperature range for maintaining performance:-60 to+60°C

　　Vibration resistance:10-2000 Hz,10 g

　　Impact resistance:12 g,2-20 ms

　　Thermal sensor:TD version,overheating signal above approximately+60...+70°C

　　Weight of electrolyte:not exceeding 25 kg

　　Size:392×175.5×229 mm

　　Battery retention:30 days

　　Warranty period for cold and temperate climates:5 years

　　Warranty period in tropical climate:3 years

　　Service life in tropical climate:not less than 3 years

　　Technical document:Battery Passport/Aircraft Battery Maintenance Document