SkyView HDX System Fuel Flow Sensor and Mounting Bracket Installation Guide
Cessna 172 Skyhawk · Avionics Manual
Overview
This document is an installation guide for the SkyView HDX System's fuel flow sensor and mounting bracket specifically designed for carbureted Cessna 172 models. It provides detailed instructions on how to properly install the sensor and bracket to ensure accurate fuel flow measurements. The guide emphasizes safety precautions and installation requirements to prevent damage to fuel system components and ensure optimal performance. It is intended for use by technicians and pilots familiar with aircraft maintenance and installation procedures.
- The document is specifically for the Cessna 172 carbureted models.
- The fuel flow sensor must be installed downstream of fuel filters and pumps.
- Avoid installing the sensor near the exhaust system to prevent heat damage.
- Do not use 90-degree fittings on the sensor to ensure accurate fuel flow data.
- The sensor should be oriented with the wiring harness pointing upwards.
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Installing the Bracket and Sensor
This section outlines the requirements for installing the fuel flow sensor and mounting bracket. Key instructions include avoiding installation near exhaust systems to prevent heat damage, not using 90-degree fittings to prevent turbulence, and ensuring the sensor is located downstream of fuel filters and pumps. The installation steps detail how to attach the mounting bracket to the engine mount support tubes and secure the sensor in the correct orientation.
Safety Precautions
Important safety notes include the prohibition of installing components near the exhaust system and the avoidance of 90-degree fittings on the sensor's input and output ends. These precautions are crucial to maintain the integrity of the fuel system and ensure accurate fuel flow readings.
Installation Steps
The installation steps provide a clear, sequential process for attaching the mounting bracket and sensor. It includes specific instructions on the orientation of the sensor, securing it with appropriate hardware, and connecting fuel hoses and fittings.
Safety notes
- DO NOT install the sensor, hoses, or fittings near the exhaust system or turbocharger.
- DO NOT install 90-degree fittings on the input or output ends of the sensor.
Full document text
SkyView HDX System Fuel Flow Sensor and Mounting Bracket Installation Guide Cessna 172 Carbureted Models 103825-000 Revision A 7/15/2019 Copyright © 2019 by Dynon Avionics, Inc. Dynon Avionics grants third parties' permission to print this document Contact Information Dynon Avionics, Inc. 19825 141st Place NE Woodinville, WA 98072 Phone: 425-402-0433 Business Operations: 8:00 AM–5:00 PM (Pacific Time) Monday–Friday Technical Support Operations: 7:00 AM–4:00 PM (Pacific Time) Monday–Friday Email Sales: sales@dynoncertified.com Email Support: support@dynoncertified.com Fax: 425-984-1751 Web: www.dynoncertified.com Copyright ©2019 Dynon Avionics, Inc. All rights reserved. No part of this manual may be reproduced, copied, transmitted, disseminated or stored in any storage medium, for any purpose without the express written permission of Dynon Avionics. Dynon Avionics hereby grants permission to download a single copy of this manual and of any revision to this manual onto a hard drive or other electronic storage medium to be viewed for personal use, provided that such electronic or printed copy of this manual or revision must contain the complete text of this copyright notice and provided further that any unauthorized commercial distribution of this manual or any revision hereto is strictly prohibited. Information in this document is subject to change without notice. Dynon Avionics reserves the right to change or improve its products and to make changes in the content without obligation to notify any person or organization of such changes. Visit the Dynon Avionics website (www.dynonavionics.com) for current updates and supplemental information concerning the use and operation of this and other Dynon Avionics products. SkyView HDX System Fuel Flow Sensor and Mounting Bracket Installation Guide - Cessna 172, Revision A Page | 1 Revision History REV DATE APPROVED DESCRIPTION OF CHANGE A 07/15/2019 ECO 330582 Initial Release Page | 2 SkyView HDX System Fuel Flow Sensor and Mounting Bracket Installation Guide - Cessna 172, Revision A Installing the Bracket and Sensor Observe the following requirements when installing the mounting bracket and fuel flow sensor: • DO NOT install the sensor, hoses, or fittings near the exhaust system or turbocharger. Excessive heat can damage fuel system components. • DO NOT install 90-degree fittings (elbows) on the input or output ends of the sensor. Doing so will cause turbulence in the fuel flow which causes inaccurate fuel flow data. • Locate the sensor downstream of fuel filters/strainers, electric boost pumps, engine- driven pump, and when possible, the fuel-metering device. • Install the sensor with the wiring harness pointed upwards. • For best measuring performance, the fuel should travel upward by one (1) to two (2) inches (2.54-5.08 cm) after passing through the sensor. The fuel flow sensor mounting bracket (P/N 503184-000) locates the sensor in the fuel system of carbureted Cessna 172 models so it meets requirements listed above. To install the fuel flow sensor and mounting bracket: 1. Attach mounting bracket (see Figure 1) to lower left engine mount support tube, which is below the upper tube cluster weldment (see Figure 2). Use an Adel clamp appropriate for tubing size and AN/MS hardware. 2. Attach mounting bracket (see Figure 1) to horizontal engine mount cross support tube, which is inboard of the tube cluster weldment (see Figure 2). Use an Adel clamp appropriate for tubing size and AN/MS hardware. 3. Locate the sensor so that: • The wire harness is oriented upwards and fits through slot between two lower flanges. • The mounting holes align with the mounting holes in the flanges. • The inlet end is oriented toward fuel strainer, and the outlet port is oriented toward carburetor (see Figure 2). 4. Secure sensor to mounting bracket (see Figure 2) using AN/MS hardware. 5. Install fuel hoses and fittings to complete installation. SkyView HDX System Fuel Flow Sensor and Mounting Bracket Installation Guide - Cessna 172, Revision A Page | 3 Figures Figure 1: Cessna 172 Fuel Flow Sensor Mounting Bracket, 503184-000 Figure 2: Cessna 172 Fuel Flow Sensor Installation
