From the Cockpit to the Wrist
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Pitot-Static System Blockage Effects on Airspeed Indicator
The Dramatic Effects of Pitot-Static System Blockages and Failures by Luiz Roberto Monteiro de Oliveira . Table of Contents I ‐ Introduction…………………………………………………………………………………………………………….1 II ‐ Pitot‐Static Instruments…………………………………………………………………………………………..3 III ‐ Blockage Scenarios – Description……………………………..…………………………………….…..…11 IV ‐ Examples of the Blockage Scenarios…………………..……………………………………………….…15 V ‐ Disclaimer………………………………………………………………………………………………………………50 VI ‐ References…………………………………………………………………………………………….…..……..……51 Please also review and understand the disclaimer found at the end of the article before applying the information contained herein. I - Introduction This article takes a comprehensive look into Pitot-static system blockages and failures. These typically affect the airspeed indicator (ASI), vertical speed indicator (VSI) and altimeter. They can also affect the autopilot auto-throttle and other equipment that relies on airspeed and altitude information. There have been several commercial flights, more recently Air France's flight 447, whose crash could have been due, in part, to Pitot-static system issues and pilot reaction. It is plausible that the pilot at the controls could have become confused with the erroneous instrument readings of the airspeed and have unknowingly flown the aircraft out of control resulting in the crash. The goal of this article is to help remove or reduce, through knowledge, the likelihood of at least this one link in the chain of problems that can lead to accidents. Table 1 below is provided to summarize -
Airspeed Indicator Calibration
TECHNICAL GUIDANCE MATERIAL AIRSPEED INDICATOR CALIBRATION This document explains the process of calibration of the airspeed indicator to generate curves to convert indicated airspeed (IAS) to calibrated airspeed (CAS) and has been compiled as reference material only. i Technical Guidance Material BushCat NOSE-WHEEL AND TAIL-DRAGGER FITTED WITH ROTAX 912UL/ULS ENGINE APPROVED QRH PART NUMBER: BCTG-NT-001-000 AIRCRAFT TYPE: CHEETAH – BUSHCAT* DATE OF ISSUE: 18th JUNE 2018 *Refer to the POH for more information on aircraft type. ii For BushCat Nose Wheel and Tail Dragger LSA Issue Number: Date Published: Notable Changes: -001 18/09/2018 Original Section intentionally left blank. iii Table of Contents 1. BACKGROUND ..................................................................................................................... 1 2. DETERMINATION OF INSTRUMENT ERROR FOR YOUR ASI ................................................ 2 3. GENERATING THE IAS-CAS RELATIONSHIP FOR YOUR AIRCRAFT....................................... 5 4. CORRECT ALIGNMENT OF THE PITOT TUBE ....................................................................... 9 APPENDIX A – ASI INSTRUMENT ERROR SHEET ....................................................................... 11 Table of Figures Figure 1 Arrangement of instrument calibration system .......................................................... 3 Figure 2 IAS instrument error sample ........................................................................................ 7 Figure 3 Sample relationship between -
Sept. 12, 1950 W
Sept. 12, 1950 W. ANGST 2,522,337 MACH METER Filed Dec. 9, 1944 2 Sheets-Sheet. INVENTOR. M/2 2.7aar alwg,57. A77OAMA). Sept. 12, 1950 W. ANGST 2,522,337 MACH METER Filed Dec. 9, 1944 2. Sheets-Sheet 2 N 2 2 %/ NYSASSESSN S2,222,W N N22N \ As I, mtRumaIII-m- III It's EARAs i RNSITIE, 2 72/ INVENTOR, M247 aeawosz. "/m2.ATTORNEY. Patented Sept. 12, 1950 2,522,337 UNITED STATES ; :PATENT OFFICE 2,522,337 MACH METER Walter Angst, Manhasset, N. Y., assignor to Square D Company, Detroit, Mich., a corpora tion of Michigan Application December 9, 1944, Serial No. 567,431 3 Claims. (Cl. 73-182). is 2 This invention relates to a Mach meter for air plurality of posts 8. Upon one of the posts 8 are craft for indicating the ratio of the true airspeed mounted a pair of serially connected aneroid cap of the craft to the speed of sound in the medium sules 9 and upon another of the posts 8 is in which the aircraft is traveling and the object mounted a diaphragm capsuler it. The aneroid of the invention is the provision of an instrument s: capsules 9 are sealed and the interior of the cas-l of this type for indicating the Mach number of an . ing is placed in communication with the static aircraft in fight. opening of a Pitot static tube through an opening The maximum safe Mach number of any air in the casing, not shown. The interior of the dia craft is the value of the ratio of true airspeed to phragm capsule is connected through the tub the speed of sound at which the laminar flow of ing 2 to the Pitot or pressure opening of the Pitot air over the wings fails and shock Waves are en static tube through the opening 3 in the back countered. -
FAA Advisory Circular AC 91-74B
U.S. Department Advisory of Transportation Federal Aviation Administration Circular Subject: Pilot Guide: Flight in Icing Conditions Date:10/8/15 AC No: 91-74B Initiated by: AFS-800 Change: This advisory circular (AC) contains updated and additional information for the pilots of airplanes under Title 14 of the Code of Federal Regulations (14 CFR) parts 91, 121, 125, and 135. The purpose of this AC is to provide pilots with a convenient reference guide on the principal factors related to flight in icing conditions and the location of additional information in related publications. As a result of these updates and consolidating of information, AC 91-74A, Pilot Guide: Flight in Icing Conditions, dated December 31, 2007, and AC 91-51A, Effect of Icing on Aircraft Control and Airplane Deice and Anti-Ice Systems, dated July 19, 1996, are cancelled. This AC does not authorize deviations from established company procedures or regulatory requirements. John Barbagallo Deputy Director, Flight Standards Service 10/8/15 AC 91-74B CONTENTS Paragraph Page CHAPTER 1. INTRODUCTION 1-1. Purpose ..............................................................................................................................1 1-2. Cancellation ......................................................................................................................1 1-3. Definitions.........................................................................................................................1 1-4. Discussion .........................................................................................................................6 -
Aviation Glossary
AVIATION GLOSSARY 100-hour inspection – A complete inspection of an aircraft operated for hire required after every 100 hours of operation. It is identical to an annual inspection but may be performed by any certified Airframe and Powerplant mechanic. Absolute altitude – The vertical distance of an aircraft above the terrain. AD - See Airworthiness Directive. ADC – See Air Data Computer. ADF - See Automatic Direction Finder. Adverse yaw - A flight condition in which the nose of an aircraft tends to turn away from the intended direction of turn. Aeronautical Information Manual (AIM) – A primary FAA publication whose purpose is to instruct airmen about operating in the National Airspace System of the U.S. A/FD – See Airport/Facility Directory. AHRS – See Attitude Heading Reference System. Ailerons – A primary flight control surface mounted on the trailing edge of an airplane wing, near the tip. AIM – See Aeronautical Information Manual. Air data computer (ADC) – The system that receives and processes pitot pressure, static pressure, and temperature to present precise information in the cockpit such as altitude, indicated airspeed, true airspeed, vertical speed, wind direction and velocity, and air temperature. Airfoil – Any surface designed to obtain a useful reaction, or lift, from air passing over it. Airmen’s Meteorological Information (AIRMET) - Issued to advise pilots of significant weather, but describes conditions with lower intensities than SIGMETs. AIRMET – See Airmen’s Meteorological Information. Airport/Facility Directory (A/FD) – An FAA publication containing information on all airports, seaplane bases and heliports open to the public as well as communications data, navigational facilities and some procedures and special notices. -
Module-7 Lecture-29 Flight Experiment
Module-7 Lecture-29 Flight Experiment: Instruments used in flight experiment, pre and post flight measurement of aircraft c.g. Module Agenda • Instruments used in flight experiments. • Pre and post flight measurement of center of gravity. • Experimental procedure for the following experiments. (a) Cruise Performance: Estimation of profile Drag coefficient (CDo ) and Os- walds efficiency (e) of an aircraft from experimental data obtained during steady and level flight. (b) Climb Performance: Estimation of Rate of Climb RC and Absolute and Service Ceiling from experimental data obtained during steady climb flight (c) Estimation of stick free and fixed neutral and maneuvering point using flight data. (d) Static lateral-directional stability tests. (e) Phugoid demonstration (f) Dutch roll demonstration 1 Instruments used for experiments1 1. Airspeed Indicator: The airspeed indicator shows the aircraft's speed (usually in knots ) relative to the surrounding air. It works by measuring the ram-air pressure in the aircraft's Pitot tube. The indicated airspeed must be corrected for air density (which varies with altitude, temperature and humidity) in order to obtain the true airspeed, and for wind conditions in order to obtain the speed over the ground. 2. Attitude Indicator: The attitude indicator (also known as an artificial horizon) shows the aircraft's relation to the horizon. From this the pilot can tell whether the wings are level and if the aircraft nose is pointing above or below the horizon. This is a primary instrument for instrument flight and is also useful in conditions of poor visibility. Pilots are trained to use other instruments in combination should this instrument or its power fail. -
SERVICE ALERT Avidyne Primary Flight Display {P/Ns: 700-00006-000,-001,-002,-003,-100}
SA-08-001 12 February 2008 SERVICE ALERT Avidyne Primary Flight Display {P/Ns: 700-00006-000,-001,-002,-003,-100} This SERVICE ALERT communicates important safety information concerning aircraft equipped with certain Avidyne EXP5000 Primary Flight Displays (PFDs). BACKGROUND INFORMATION Avidyne has received a limited number of field reports of PFDs displaying incorrect altitude and airspeed information. None of these occurrences led to an accident or incident. These occurrences included incorrect display of information at system startup, including one or more of the following: • Altitude significantly in error when compared to field elevation with local barometric correction setting entered on PFD. • Altitude significantly in error when compared to backup altimeter with identical barometric correction settings on both. • Non-zero airspeed (inconsistent with high winds or propwash from a nearby airplane) indicated at system startup. • Altitude or airspeed indications that vary noticeably after startup under static conditions. • Erroneous airspeed indications in combination with erroneous attitude indications. • A steady or intermittent “red X” in place of the airspeed indicator, altimeter, VSI or attitude indicator. Aircraft exhibiting any of these incorrect indications should not be flown. In any case where an erroneous indication is present at system startup (without an identifiable external cause such as surface winds or propwash) and this indication subsequently returns to normal, the PFD should nonetheless be considered unreliable and the aircraft should not be flown. As a normal practice, all pilots should be vigilant in conducting proper preflight and in- flight checks of instrument accuracy, including: • Preflight check of the accuracy of both the primary and backup altimeter against known airfield elevation and against each other. -
Chapter: 4. Approaches
Chapter 4 Approaches Introduction This chapter discusses general planning and conduct of instrument approaches by pilots operating under Title 14 of the Code of Federal Regulations (14 CFR) Parts 91,121, 125, and 135. The operations specifications (OpSpecs), standard operating procedures (SOPs), and any other FAA- approved documents for each commercial operator are the final authorities for individual authorizations and limitations as they relate to instrument approaches. While coverage of the various authorizations and approach limitations for all operators is beyond the scope of this chapter, an attempt is made to give examples from generic manuals where it is appropriate. 4-1 Approach Planning within the framework of each specific air carrier’s OpSpecs, or Part 91. Depending on speed of the aircraft, availability of weather information, and the complexity of the approach procedure Weather Considerations or special terrain avoidance procedures for the airport of intended landing, the in-flight planning phase of an Weather conditions at the field of intended landing dictate instrument approach can begin as far as 100-200 NM from whether flight crews need to plan for an instrument the destination. Some of the approach planning should approach and, in many cases, determine which approaches be accomplished during preflight. In general, there are can be used, or if an approach can even be attempted. The five steps that most operators incorporate into their flight gathering of weather information should be one of the first standards manuals for the in-flight planning phase of an steps taken during the approach-planning phase. Although instrument approach: there are many possible types of weather information, the primary concerns for approach decision-making are • Gathering weather information, field conditions, windspeed, wind direction, ceiling, visibility, altimeter and Notices to Airmen (NOTAMs) for the airport of setting, temperature, and field conditions. -
OSR ISS ISU Rev 0
U.S. Department of Transportation Federal Aviation Administration Washington, DC Operational Suitability Report (OSR) Revision: Original Date: 08/06/2018 Innovative Solutions & Support Integrated Standby Unit with Autothrottle Christy Helgeson, Chair Flight Standardization Board (FSB) Federal Aviation Administration (FAA) Small Aircraft Branch 901 Locust Street, Room 332 Kansas City, MO 64106 Telephone: (816) 329-3238 Fax: (816) 329-3241 Innovative Solutions & Support Revision: Original Integrated Standby Unit with Autothrottle 08/06/2018 Operational Suitability Report TABLE OF CONTENTS Section Page RECORD OF REVISIONS .............................................................................................................3 1. PURPOSE AND APPLICABILITY ........................................................................................4 2. DESCRIPTION ........................................................................................................................4 3. PROCEDURES FOR USE OF THE ISU A/T .........................................................................7 4. SPECIFICATIONS FOR TRAINING AND CHECKING ......................................................7 2 of 7 Innovative Solutions & Support Revision: Original Integrated Standby Unit with Autothrottle 08/06/2018 Operational Suitability Report RECORD OF REVISIONS Revision Number Sections Date Original All 08/06/2018 3 of 7 Innovative Solutions & Support Revision: Original Integrated Standby Unit with Autothrottle 08/06/2018 Operational Suitability Report -
FAA-H-8083-15, Instrument Flying Handbook -- 1 of 2
i ii Preface This Instrument Flying Handbook is designed for use by instrument flight instructors and pilots preparing for instrument rating tests. Instructors may find this handbook a valuable training aid as it includes basic reference material for knowledge testing and instrument flight training. Other Federal Aviation Administration (FAA) publications should be consulted for more detailed information on related topics. This handbook conforms to pilot training and certification concepts established by the FAA. There are different ways of teaching, as well as performing, flight procedures and maneuvers and many variations in the explanations of aerodynamic theories and principles. This handbook adopts selected methods and concepts for instrument flying. The discussion and explanations reflect the most commonly used practices and principles. Occasionally the word “must” or similar language is used where the desired action is deemed critical. The use of such language is not intended to add to, interpret, or relieve a duty imposed by Title 14 of the Code of Federal Regulations (14 CFR). All of the aeronautical knowledge and skills required to operate in instrument meteorological conditions (IMC) are detailed. Chapters are dedicated to human and aerodynamic factors affecting instrument flight, the flight instruments, attitude instrument flying for airplanes, basic flight maneuvers used in IMC, attitude instrument flying for helicopters, navigation systems, the National Airspace System (NAS), the air traffic control (ATC) system, instrument flight rules (IFR) flight procedures, and IFR emergencies. Clearance shorthand and an integrated instrument lesson guide are also included. This handbook supersedes Advisory Circular (AC) 61-27C, Instrument Flying Handbook, which was revised in 1980. -
Study of the Pilot's Attention in the Cabin During the Flight Auxiliary Devices Such As Variometer, Turn Indicator with Crosswise Or Other
Journal of KONES Powertrain and Transport, Vol. 25, No. 3 2018 ISSN: 1231-4005 e-ISSN: 2354-0133 DOI: 10.5604/01.3001.0012.4309 STUDY OF THE PILOT’S ATTENTION IN THE CABIN DURING THE FLIGHT Mirosław Adamski, Mariusz Adamski, Ariel Adamski Polish Air Force Academy, Department of Aviation Dywizjonu 303 Street 35, 08-521 Deblin, Poland tel.: +48 261 517423, fax: +48 261 517421 e-mail: [email protected] [email protected], [email protected] Andrzej Szelmanowski Air Force Institute of Technology Ksiecia Boleslawa Street 6, 01-494 Warsaw, Poland tel.: +48 261 851603, fax: +48 261 851646 e-mail: [email protected] Abstract The pilot, while performing certain tasks or being in the battlefield environment works in a time lag. He is forced to properly interpret the information and quickly and correctly take action. Therefore, the instruments in the cabin should be arranged in such a way that they are legible and the operator have always-easy access to them. Due to the dynamics of the aircraft and the time needed to process the information by the pilot, a reaction delay occurs, resulting in the plane flying in an uncontrolled manner even up to several hundred meters. This article discusses the VFR and IFR flight characteristics, the pilot’s attention during flight, cabin ergonomics, and the placement of on-board instruments having a significant impact on the safety of the task performed in the air. In addition, tests have been carried out to determine exactly what the pilot’s eye is aimed at while completing the aerial task. -
PILOTS GUIDE INTEGRATED STANDBY UNIT (ISU) with AUTOTHROTTLE (A/T) P/N: 9D-88126-1 (Legacy PC-12) P/N: 9D-88126-3 (PC-12 NG)
Application Revisions Next Assy Used On Rev. Description Date Approved Approved 9K-88126-1 9K-88126-1 1 Initial Release per EC 14012 6/22/18 DB 9K-88126-3 9K-88126-3 2 Revised per EC 14069 7/24/18 DB 3 Revised per EC 14119 9/12/18 DB 4 Revised per EC 14128 9/21/18 DB 5 Revised per EC 14167 11/2/18 DB 6 Revised per EC 14167 11/20/18 DB PROPRIETARY THE RIGHTS OF INNOVATIVE SOLUTIONS & SUPPORT INC. ARE INCLUDED IN THE INFORMATION DISCLOSED HEREIN. THIS DRAWING AND/OR DOCUMENT SHALL NOT BE REPRODUCED OR TRANSFERRED TO OTHER DOCUMENTS OR USED OR DISCLOSED TO OTHERS FOR MANUFACTURING OR FOR ANY PURPOSE EXCEPT AS SPECIFICALLY AUTHORIZED IN WRITING BY INNOVATIVE SOLUTIONS & SUPPORT INC. PILOTS GUIDE INTEGRATED STANDBY UNIT (ISU) with AUTOTHROTTLE (A/T) P/N: 9D-88126-1 (Legacy PC-12) P/N: 9D-88126-3 (PC-12 NG) Contract Number: Contractor: Written By: M. Rudy Date: 6/21/18 PILOTS GUIDE Checker: Date: INTEGRATED STANDBY UNIT (ISU) Engineer: M. Rudy Date: 6/21/18 with AUTOTHROTTLE (A/T) Document Approval: D. Babe Date: 6/22/18 CAGE CODE QA Approval: B. Urbanski Date: 6/22/18 0EUW0 1D-13470 Design Approval: M. Knopf Date: 6/22/18 Form# 07315-372 Rev - SHEET 1 of 40 REVISION HISTORY Rev 6 Par 2.1: Modified to remove engine start mode with voltage monitoring and temperature protection. Removed Par 2.2 "Engine Start Mode" and all associated subparagraphs. Par 2.2: Changed from Par 2.3 and corrected spelling issue in header Par 2.2.1: Removed reference to engine start mode Rev 5 Added descriptions of Hot Start and Low Voltage Protection in Section 2.0.