101-384028-43 - Textron Aviation OEM Barometric Pressure Switch

101-384028-43 – Textron Aviation OEM Barometric Pressure Switch

Available now on the Airparts.aero Marketplace.

Overview

The Textron Aviation 101-384028-43 is a genuine OEM barometric pressure switch, a precision-calibrated sensor and switch assembly engineered for the environmental and pressurization systems of the Beechcraft King Air series. This is not a direct pressure sensor, but an altitude-sensing switch designed to automatically activate or deactivate a specific aircraft system as it climbs or descends through a predetermined pressure altitude. Its primary function is typically to control the engagement of the air conditioning system, reducing pilot workload and optimizing system performance. As a genuine Textron OEM part, it guarantees the precise calibration and reliability required for automated system control.

Key Features

• Automatic Altitude-Based Actuation: The switch is factory-calibrated to actuate at a specific barometric pressure that corresponds to a pre-set altitude. This allows for the fully automatic control of an onboard system without any pilot input.
• Aneroid Bellows Mechanism: Utilizes a highly sensitive and reliable aneroid bellows as its core sensing element. The bellows expands or contracts in response to changes in ambient air pressure, providing the mechanical force to trip the integrated electrical switch.
• Reduces Pilot Workload: By automating functions like the engagement of the air conditioning system upon descent, this switch allows the flight crew to focus on more critical tasks during busy phases of flight.
• Durable & Reliable Construction: Housed in a robust casing with precision electrical connectors and a port for connection to the aircraft's static pressure system, it is built to provide years of reliable service in the demanding airframe environment.
• Genuine Textron OEM Part: As a genuine factory component, it ensures perfect integration with the King Air's electrical and environmental systems and guarantees that the actuation point is calibrated to the exact altitude specified by the aircraft's designers.

Technical Specifications

• Part Number: 101-384028-43
• Component Type: Barometric Pressure / Altitude Sensing Switch
• Sensing Mechanism: Aneroid Bellows
• Switch Type: Microswitch (specific configuration, e.g., SPDT, may vary)
• Primary Function: Automatic control of air conditioning or other altitude-dependent systems.
• Pressure Source: Aircraft Static Port
• Certification: FAA Production Approval

Aircraft Compatibility

The 101-384028-43 is a specific component designed for the sophisticated environmental systems of the Beechcraft King Air family. It is imperative to consult the specific aircraft's Illustrated Parts Catalog (IPC) for final verification.

• Primary Aircraft Models:
  • 1900 Airliner
  • 1900C Airliner
  • King Air 350 or 350C FM-1 to FM-35
  • King Air 360, 350i or 350C FM-36 & on
  • King Air B200, B200T, B200C or B200CT
  • King Air B200GT or B200CGT
  • King Air C90, C90A, C90GT or E90
  • King Air C90GTi Series
  • Premier Model 390

List not comprehensive, may be applicable on other models.

Applications

The 101-384028-43 is a key component for system automation and passenger comfort:

• Air Conditioning Control: Its most common application is to automatically engage the air conditioning compressor as the aircraft descends through a specific altitude (e.g., 12,500 feet), ensuring the cabin is cool upon arrival in warmer climates.
• Pressurization System Logic: Can be used as an input for various pressurization system modes, providing altitude-based logic to the cabin pressure controller.
• System Troubleshooting: A key component to inspect when diagnosing issues with an automatically controlled environmental system.

Why Choose 101-384028-43?

The automated systems on a high-performance aircraft like the King Air are designed to enhance safety and reduce pilot workload. The reliability of these systems depends on the accuracy of their sensors. The 101-384028-43 is the genuine, factory-calibrated switch required for this system to function as intended. Using a non-certified or improperly calibrated switch could lead to the system not engaging or engaging at the wrong time. For the seamless and reliable operation of your aircraft's environmental systems, trust only genuine Textron Aviation OEM components.

Order Your 101-384028-43 Pressure Switch Now

Ensure the reliability of your aircraft's automated systems with a genuine, factory-calibrated Textron Aviation component. Visit Airparts.aero to order your 101-384028-43 barometric pressure switch today.

The 101-384028-43 barometric switch is an elegant and reliable example of mechanical automation. The sealed aneroid bellows contains a captive pocket of air at a reference pressure. As the aircraft climbs, the outside air pressure drops, causing the bellows to expand. Conversely, as the aircraft descends, the rising outside air pressure compresses the bellows. This physical expansion and contraction is a predictable function of pressure altitude. The switch is designed so that at a specific point in the bellows' travel—corresponding to the desired activation altitude—it makes or breaks contact on an electrical microswitch. This simple, direct mechanical action provides a highly reliable method of automating a system based on altitude, without the need for complex digital air data computers.

Note: This is a flight-critical system component. Installation and testing must be performed by a certified A&P mechanic with experience in King Air environmental and pressurization systems, in accordance with the current Textron Aviation maintenance manual. The switch must be connected to the correct static pressure source for proper operation.Applicable Aircraft

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