BSDT (1477B)
Trajectory Interface Unit
Description
BSDT (1477B) trajectory-sensor interface unit
BSDT (1477B) is the trajectory-sensor interface unit used in the SAU-1T family of automatic flight-control systems. The aircraft maintenance description identifies it as a computing and switching link between the autopilot and the radio landing and navigation sources. The designation 1477B identifies the block family; the series number on the data plate must also be retained when selecting a replacement.
Full descriptionCollapse description
Function in the automatic flight-control system
The block receives information associated with the radio landing system and the aircraft navigation and attitude channels. Its documented tasks include linking the autopilot with the landing receiver group, KSh-76, TKS-P and the air-data system, forming and amplifying control signals, and performing the switching required when operating modes change. It also participates in failure and readiness signalling for director-control operation.
Documented Il-76 application
The technical description for the Il-76 lists one BSDT block under schematic position 3019. The same equipment family is associated with SAU-1T-2B(BT,T), SAU-1T-2-62 and SAU-1T-2-86 installations. Effectivity can depend on aircraft serial number: the document distinguishes Series 3 and Series 5 executions, so the full plate and aircraft records are required.
BSDT (1477B) identification and compatibility
A block marked BSDT, BSDT-1477B or БСДТ (1477Б) should not be selected solely by the shared base index. Confirm the series, assembly number, connectors and the configuration of the autopilot, radio landing system and air-data equipment. The block is not a trajectory sensor itself; it is the interface and computation unit that processes and routes those signals.
Inspection and ordering
Before installation, inspect the enclosure, rack fittings, connector contacts, seals and all nameplate lines. Bench verification requires the approved SAU-1T procedure and known test connections. State the aircraft type and serial, automatic-control-system version, exact BSDT series, quantity, condition and document requirements in the enquiry. Related equipment is listed under Electronic Control Units.
Technical details
- Product Type
- Trajectory-sensor interface and computing unit
- Primary Designation
- BSDT (1477B)
- Original Cyrillic Designation
- БСДТ (1477Б)
- Documented Function
- Interface between the autopilot and landing, navigation, attitude and air-data sources
- Documented Systems
- SAU-1T-2B(BT,T), SAU-1T-2-62 and SAU-1T-2-86
All specificationsCollapse specifications
- Associated Equipment
- Radio landing receiver group, KSh-76, TKS-P and SVS1-72-IV / applicable air-data execution
- Signal Tasks
- Computation, formation and amplification of control signals; mode switching
- Indication Tasks
- Failure and director-control readiness signalling as specified by the aircraft documentation
- Documented Aircraft
- Il-76 family; exact effectivity by aircraft serial and SAU execution
- Schematic Position
- 3019 in the reviewed Il-76 equipment description
- Documented Quantity
- One unit per documented installation
- Known Executions
- Series 3 and Series 5 are distinguished in the aircraft documentation
- Alternative Designations
- BSDT; BSDT-1477B; BSDT 1477B; БСДТ; БСДТ-1477Б; БСДТ (1477Б)
- Interchangeability
- Only after matching the series, assembly, connectors and SAU configuration
- Documentation
- Product passport, SAU-1T technical description and aircraft effectivity records
Payment & delivery
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