9954100-5 – Textron Aviation OEM Exhaust Stack Riser Assembly LH for Cessna 172
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Overview
The Textron Aviation 9954100-5 is a genuine OEM exhaust stack riser assembly, specifically engineered for the left-hand (LH) side of the engine on various Cessna 172 models. This flight-critical component is the primary conduit for routing superheated, high-pressure exhaust gases from the engine's cylinders safely away from the aircraft. Manufactured from high-temperature, corrosion-resistant stainless steel, this assembly is designed to withstand extreme thermal cycling and constant vibration. As a genuine Textron OEM part, it guarantees the precise fit, material integrity, and aerodynamic profile required for safe, reliable, and efficient engine operation.
Key Features
- High-Temperature Stainless Steel: Fabricated from 321-grade corrosion-resistant steel (CRES), a high-performance alloy stabilized with titanium. This material is specifically chosen for its exceptional strength retention and resistance to cracking and intergranular corrosion at the extreme temperatures of aircraft exhaust systems.
- Precision Fit & Geometry: Engineered to the exact dimensions of the original factory part, ensuring perfect alignment with the cylinder exhaust ports, mounting brackets, and the muffler inlet. This eliminates installation difficulties and prevents pre-loading stress that can lead to premature failure.
- Vibration-Resistant Design: Incorporates specific bends, flanges, and sometimes slip joints designed to absorb the intense vibration of the reciprocating engine, preventing the transmission of damaging stress to the exhaust flanges or the firewall.
- Heat Shield & Cabin Safety: Plays a critical role in directing intense exhaust heat away from other engine components, wiring, and the firewall, which is essential for preventing in-flight fires and protecting the integrity of the cabin.
- Genuine Textron OEM Part: Guarantees conformance to the stringent material, manufacturing, and quality control standards of the original aircraft Type Certificate. This is the only way to ensure the part will perform safely and reliably as intended by the aircraft's designers.
Technical Specifications
- Part Number: 9954100-5
- Component Type: Exhaust Stack Riser Assembly, Left Hand (LH)
- Material: 321 Corrosion-Resistant Steel (CRES)
- Application: Collects exhaust gas from cylinders (typically #2 and #4) and routes it to the muffler assembly.
- Features: Precision-welded flanges, support brackets.
- Certification: FAA Production Approval
** ALTERNATIVE PRODUCTS **
- A9954100-5
Aircraft Compatibility
The 9954100-5 is the specific OEM exhaust riser for certain models and serial number ranges of the Cessna 172 Skyhawk. It is imperative to consult the specific aircraft's Illustrated Parts Catalog (IPC) for final verification of applicability.
- Primary Aircraft Models (Examples):
- Cessna 172R
- Cessna 172S
Applications
The 9954100-5 is a flight-critical component with several essential roles:
- Exhaust Gas Conveyance: Its primary function is to safely channel hot, toxic exhaust gases from the cylinders to the muffler and overboard.
- Engine Performance: The design and backpressure of the exhaust system have a direct impact on engine performance and efficiency.
- Mandatory Inspection & Replacement Item: Exhaust systems are subject to rigorous and frequent inspections for cracks, leaks, and warping. This component is replaced when any non-repairable defect is found, as exhaust leaks can be catastrophic.
Why Choose 9954100-5?
A failure in the exhaust system can have severe consequences, including carbon monoxide poisoning of the cabin occupants, an in-flight fire, or damage to critical engine components. Using a genuine Textron Aviation 9954100-5 OEM exhaust riser is the only way to ensure the part has the correct material alloy to resist heat fatigue and the precise geometry to fit without inducing stress. For a component this critical to safety, there is no substitute for the certified quality and guaranteed performance of a genuine OEM part.
Order Your 9954100-5 Exhaust Riser Assembly Now
Ensure the safety and performance of your aircraft with a genuine Textron Aviation OEM exhaust component. Visit Airparts.aero to order your 9954100-5 exhaust riser assembly today.
The 9954100-5 exhaust riser assembly operates in one of the harshest environments on the aircraft. It must contain gases that can exceed 1,400°F (760°C) while simultaneously enduring constant, high-frequency vibration from the engine. The use of 321 stainless steel is critical because the inclusion of titanium in the alloy prevents chromium carbide precipitation at high temperatures. This phenomenon, known as "weld decay," can make standard stainless steels susceptible to intergranular corrosion along weld seams. By using stabilized 321 CRES, the riser maintains its structural integrity and corrosion resistance throughout its service life, providing a robust defense against the cracks and leaks that can ground an aircraft.
Note: This is a flight-critical component. Installation must be performed by a certified A&P mechanic in strict accordance with the current Textron Aviation maintenance manual. Always use new, specified exhaust gaskets and hardware during installation. A thorough inspection for leaks must be performed after installation and engine run-up.
