S1132-1 - Textron Aviation OEM Union

S1132-1 – Textron Aviation OEM Union for -4 Pitot-Static Tube Fittings

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Overview

The S1132-1 is a genuine Textron Aviation Original Equipment Manufacturer (OEM) union, a precision-machined fitting designed to create a secure, in-line connection between two pieces of 1/4-inch (-4 size) tubing. This component is a critical part of the flareless compression fittings used extensively in the pitot-static and low-pressure pneumatic instrument systems of many Cessna and Beechcraft aircraft. The union's function is to join tubing in a straight line, for either a repair splice or as part of the original system plumbing.

This is the central body of the fitting assembly and is designed to be used with two corresponding nuts and two single-use nylon sealing sleeves (such as P/N 259N04) to complete the connections. As the genuine OEM part, the S1132-1 is manufactured to the exact dimensional tolerances, including the critical internal taper, required to ensure the nylon sleeve deforms correctly to create a positive, leak-free seal.

Key Features

• Genuine Textron Aviation OEM Part: Guarantees the part is fabricated to the exact Textron engineering drawing for material, dimensions, and performance, ensuring a perfect, leak-proof seal.

• Flareless Compression Fitting Union: Allows for the joining of tubing without the need for flaring, simplifying installation and repair of instrument lines.

• Designed for -4 (1/4") Tubing: Precisely machined for use with standard 1/4-inch outside diameter aluminum or plastic instrument tubing.

• For Critical Pitot-Static Systems: The specified component for maintaining the integrity of the aircraft's primary air data system.

• Precision Machined Construction: Typically machined from high-quality brass or aluminum alloy for strength, durability, and corrosion resistance.

• Creates a Secure In-Line Splice: Provides an airworthy method for repairing a damaged section of instrument tubing or joining two sections during original assembly.

Technical Specifications

• Part Number: S1132-1

• Component Type: Flareless Compression Fitting Union Body

• OEM Authority: Textron Aviation

• For Tube Outside Diameter: 1/4 inch (-4 size)

• Material: Per OEM Drawing (Typically Brass or Aluminum Alloy).

• System Application: Low-Pressure Pneumatic, Pitot-Static Systems, Instrument Lines.

• Associated Parts: Requires two nuts and two nylon sleeves (e.g., Textron P/N 259N04) to create two complete connections.

• Governing Specification: Textron Aviation Engineering Drawing S1132.

Aircraft Compatibility

This OEM union is the specified component for instrument line connections on a vast range of Textron Aviation aircraft.

• Primary Textron Aviation Platforms:

  • Cessna Piston Aircraft (100 and 200 Series, e.g., 172, 182, 210)

  • Cessna Caravan Series

  • Certain applications in Cessna Citation business jets.

Note: Verification of applicability is the absolute responsibility of the installer. The aircraft's current Illustrated Parts Catalog (IPC) for its specific serial number is the final and absolute authority for confirming part number eligibility.

Applications

• Sole Application: To create a secure, in-line, leak-proof connection between two pieces of 1/4-inch tubing in:

  • Pitot pressure lines

  • Static pressure lines

  • Vacuum or pressure-driven gyroscopic instrument lines

  • Other low-pressure pneumatic sensing systems.

Why Choose S1132-1?

The integrity of an aircraft's pitot-static system is absolutely critical for safe flight, especially in instrument meteorological conditions (IMC). A leak from a cracked or improperly sealed fitting will cause the airspeed indicator, altimeter, and vertical speed indicator to provide dangerously erroneous information to the pilot. Only the genuine Textron Aviation OEM S1132-1 union is guaranteed to have the precise internal dimensions and surface finish required to work perfectly with the specified nylon sleeves to create a reliable, leak-free seal that will pass a pitot-static system certification check per FAR 91.411.

A leak in an aircraft's static system, which can be caused by an improperly sealed union like the S1132-1, creates a significant aerodata hazard. The static system provides ambient air pressure as a stable reference for the airspeed indicator, altimeter, and VSI. If a leak develops in a line routed within the pressurized cabin, the higher cabin pressure will be fed into the instruments. This false high static pressure causes the altimeter to read lower than the aircraft's actual altitude and the VSI to show an erroneous descent. Critically, it also causes the airspeed indicator to read higher than the actual airspeed, as the instrument calculates speed based on the differential between pitot and static pressure. A higher static pressure reference reduces this differential, leading to a lower indicated airspeed. This can lead a pilot to believe they are flying faster than they are, a particularly dangerous situation during approach to landing. This underscores why a perfectly sealed, OEM-quality fitting is non-negotiable.

Note: This is a flight-critical component. It must be used with new nylon sealing sleeves (e.g., 259N04) for every installation. The tubing ends must be cut squarely, deburred, and be perfectly clean and round. After installation, a full pitot-static system leak check in accordance with FAR 91.411 is mandatory before the aircraft is returned to service. Installation must be performed by a certified A&P or avionics technician.

Documentation

All technical data, installation procedures, and torque specifications for the S1132-1 union are proprietary to Textron Aviation. This information is contained within the official Maintenance Manual and Standard Practices documents for the applicable aircraft model. No public-facing documentation is available.