Test Procedures for Maximum Allowable Airspeed Indicators

AC 20-134 · FAA

Public domain · FAAAdvisory Circulars

Overview

The Test Procedures for Maximum Allowable Airspeed Indicators (AC 20-134) is a public-domain FAA advisory circular, republished here as a free chaptered HTML edition with a linked table of contents and the official PDF.

Publisher: FAA
Document: AC 20-134
Pages: 2

Key points

This advisory circular provides guidance on test procedures for Maximum Allowable Airspeed Indicators.
The document outlines compliance with the standards in Technical Standard Order C46a.
It cancels Advisory Circular 37-2A, dated 10/22/74.
Test procedures from SAE Aeronautical Standards AS 418A and AS 437 may be used for compliance.
Environmental limits in these procedures must be adjusted to align with TSO-C46a specifications.

Frequently asked questions

What is the purpose of AC 20-134?

The purpose of AC 20-134 is to provide guidance concerning test procedures for Maximum Allowable Airspeed Indicators.

Which previous advisory circular does this document cancel?

AC 20-134 cancels Advisory Circular 37-2A, Test Procedures for Maximum Allowable Airspeed Indicators, dated 10/22/74.

What standards can be referenced for test procedures?

Test procedures can reference SAE Aeronautical Standards AS 418A and AS 437 for compliance with TSO-C46a.

Are other test procedures acceptable?

Yes, other test procedures may also be adequate and valid for the purpose of compliance.

Where can the referenced aeronautical standards be obtained?

The aeronautical standards can be obtained from the Society of Automotive Engineers in Warrendale, Pennsylvania.

Document

0 Advisory

U.S. DeporTmenT of Transportation

Circular

Federal Aviation Administration Subject: AC No: 20-134 Date: 2/ 14/90 Otanae: Initiated by: AIR-120 TEST PROCEDURES FOR MAXIMUM ALLOiW3LE AIRSPEED INDICATORS 1 . PURPOSE. This advisory circular provides guidance concerning test procedures which may be used in showing compliance with the standards in Technical Standard Order C46a, 2. REFERENCE. Technical Standard Order (TSO) C46a, Maxinrum Allowable Airspeed Indicator Systems.

3. CANCELLATION. Advisory Circular 37-2A, Test Procedures for Maximum Allc:Mable Airspeed Indicators, dated 10/22/74, is cancelled.

4. TEST PROCEDURES.

a. Test procedures set forth in the Society of Autorootive Engineers (SAE) Aeronautical Standard (AS) 418A dated May 15, 1961, "Maxinrum AllCMable Airspeed Instrument, Reciprocating Engine Powered Aircraft, or SAE AS 437 dated April 15, 1963, "Maximum Allowable Airspeed Instrwnent, Turbine ~red SUbsonic Aircraft," may be used for the purpose of showing COlllpliance with related standards in TSO-C46a. However, environmental limits, or other limits, specified in these procedures nrust be adjusted if necessary to agree with those specified in TS0-C46a. Both aeronautical standards may be obtained from the Society of Autonotive Engineers, 400 COJmDnwealth Drive, warrendale, Pennsylvania 15096.

b. Other test procedures may also be adequate and valid for the purpose.

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