Refimprove date July 2009 QNH is one of the many Q codes . It is defined as, barometric pressure adjusted to sea level. It is a pressure setting used by Aviator pilots , air traffic control ATC , and low frequency weather beacon s to refer to the barometric setting which, when set on an aircraft s altimeter, will cause the altimeter to read altitude above mean sea level within a certain defined region. Within United Kingdom airspace, these are known as Altimeter Setting Regions ASRs these regions may be large areas, or apply only to the airfield for which the QNH was given. An airfield QNH will cause the altimeter to show airfield altitude, that is, the altitude of the centre point of the main ... forecast value of QNH for an altimeter setting region is called the Regional Pressure Setting and may ... a similar procedure is adopted and this is known as Regional QNH however this name has been ... remember QNH as Query Newlyn Harbour . Newlyn Harbour in Cornwall, UK is home to the National ... it from QFE, which novices sometimes confuse. The abbreviation QNH originates from the days ... the letters QNH would be transmitted. A common mnemonic for QNH is No Height , whereas the mnemonic often used for QFE is Field Elevation . Altitude above mean sea level QNH differs from QFE , which ... the altimeter to either the local QNH or the standard pressure setting &ndash convert 1013.25 hPa .... Air Traffic Control will pass the QNH to pilots on clearing them to descend below the Flight ... of the pilot or when the QNH changes. A typical radio conversation might be Pilot aircraft callsign , request Cotswold QNH ATC aircraft callsign , Cotswold QNH 1016 Pilot QNH 1016, aircraft callsign Here ... to read back the safety critical part of the transmission in this case, the QNH value . In most parts of the world, QNH is given in hectopascals in the past in millibars . In North America, QNH ... it Regolaggio altimetrico ja no QNH nn QNH tr Atmosfer bas nc QNH ... more details
QFF is a Q code . It is the mean sea level MSL pressure derived from the barometric pressure at the station location by calculating the weight of an imaginary air column, extending from the location to sea level, assuming the temperature and relative humidity at the location are the long term monthly mean, the temperature lapse rate is according to International Standard Atmosphere ISA and the relative humidity lapse rate is zero. QFF is the location value plotted on surface synoptic chart and is closer to reality than QNH , though it is only indirectly used in aviation. This is the Australian Bureau of Meteorology method QFF calculations differ among meteorological organisations. Another definition of QFF assuming an isothermal layer at the station temperature can be found in the article Atmospheric pressure Mean sea level pressure Mean sea level pressure . This is the barometric pressure at the surface reduced to MSL using the observed temperature at the surface this assumes an isothermal layer from MSL to that surface . QFF accounts from the effect that temperature has on the pressure lapse rate and therefore the resultant calculated pressure. The range of QFF so far recorded, low pressure to high pressure of, is from 856 to 1083 hPa. See also QNH QFE Atmospheric pressure Category Aviation meteorology Category Encodings no QFF ... more details
In aviation , pressure altitude is the indicated altitude when an altimeter is set to an agreed baseline pressure setting. The baseline pressure is 1013.25 hPa, equivalent to 1013.25 millibar, or 29.92 inches of mercury. This setting is equivalent to the air pressure at mean sea level Sea Level MSL in the International Standard Atmosphere International Standard Atmosphere ISA . Pressure altitude is primarily used in aircraft performance calculations and in high altitude flight above the Flight level Transition altitude transition altitude . In radio communication, the baseline pressure setting is referred to by the Q code Aviation Q code QNE . ref cite web last Brandon first John authorlink coauthors title Altitude and altimeters work publisher Recreational Aviation Australia Inc date 2007 04 12 url http www.auf.asn.au groundschool umodule3.html altitude format doi accessdate 2008 10 05 archiveurl http web.archive.org web 20080803173753 http www.auf.asn.au groundschool umodule3.html altitude Bot retrieved archive archivedate 2008 08 03 ref The relationship between static pressure and pressure altitude is defined in terms of the properties of the International Standard Atmosphere. See also QNH Flight Level density altitude Standard conditions for temperature and pressure Barometric formula External links http www.newbyte.co.il calc.html Newbyte Atmospheric Calculator , http market.android.com details?id appinventor.ai barkan86.AtmosCalculatorFree Android Version References reflist Category Altitudes in aviation de Barometrische H henmessung in der Luftfahrt QNE fr QNE ja fi Painekorkeus ... more details
13 Temperature and dewpoint in degrees Celsius. QNH 995 hectopascal QNH 995 hectopascal . No Significant .... Temperature 18. Dewpoint 10. QNH 1016. Threshold QFE 997 hectopascal. Departing aircraft should make ... or more. Scattered 2,800 feet. Temperature 18. Dewpoint 10. QNH 1016. Transition level flight level ... more details
primarysources date August 2011 The EUROCAT system is a computerised air traffic control and management solution developed by Thales Group Thales Air Systems Formerly Thomson CSF Thomson CSF . ref name ProductPage cite web url http www.thalesgroup.com Portfolio Aerospace Air Systems Product EUROCAT, Air Traffic Management System ?pid 1481 title EUROCAT author Thales Group accessdate 2011 09 13 ref It utilises a distributed Computer architecture computing architecture and is capable of integrating geographically dispersed air traffic control units within a Flight information region Flight Information Region e.g. control towers at different airports and en route control centres into a single coherent system. Features The Eurocat system handles a large variety of different functions required for the smooth operation of air traffic control and management. A non exhaustive list includes ref name FeatureList cite web url http www.thalesgroup.com Portfolio Documents EUROCAT February 2011 ?LangType 2057 title EUROCAT author Thales Group accessdate 2011 09 13 format PDF ref Surveillance data processing and track correlation radar, Automatic dependent surveillance broadcast ADS B , ADS C etc. Flight plan processing Communication Controller Pilot Data Link Communications CPDLC etc. Aeronautical information data processing NOTAM s, QNH , wind aloft etc. Flow control and sequencing User interface Human machine interfacing e.g. correlating data to generate controller s display Data recording Controller situational awareness and alerts generation Transponder aviation Emergency codes Squawk Emergency EMG , Radio Failure RAD , Hyjack HIJ Short Term Conflict Alert Short Term Conflict Alert STCA , Minimum Safe Altitude Warning Minimum Safe Altitude Warning MSAW , Danger area Danger Area Disambiguation needed date June 2011 Infringement Warning DAIW etc. Non Transgression Zone NTZ alert, DUPE Alerts, FPCF Alerts. References Reflist Category Air traffic control in Europe Category Air tr ... more details
QNH or altimeter setting and is available from various sources, including air traffic control ... level rowspan 2 QNH br in millibars colspan 5 Transition altitude in feet 3,000 4,000 5,000 6,000 18,000 ... on the right shows the transition level according to transition altitude and QNH. When descending ... to the QNH for the region or airfield. Note that the transition level is, by definition, less ... level as this does not guarantee separation from other traffic flying on QNH at the transition ... on QNH to the transition altitude. Therefore aircraft may be flying at both transition level and transition ... on QNH. Quadrantal rule This rule applies to Instrument flight rules IFR flights in the UK both in and outside ... more details
Infobox Aircraft accident name Independent Air Flight 1851 occurrence type Accident image image size defaults to 230 if blank alt caption date 8 February 1989 type Controlled flight into terrain site Pico Alto, br nowrap Santa Maria Island , Azores coordinates aircraft type Boeing 707 331B aircraft name operator Independent Air tail number N7231T origin Bergamo Orio al Serio Airport , Italy stopover Santa Maria Airport Azores Santa Maria Airport , br Santa Maria Island Santa Maria , Azores destination Punta Cana , br Dominican Republic passengers 137 crew 7 fatalities 144 all survivors 0 On 8 February 1989, Independent Air Flight 1851 , a Boeing 707 331B on an American charter flight from Bergamo , Italy to Punta Cana , Dominican Republic, struck Pico Alto on approach to Santa Maria Airport Azores Santa Maria Airport in the Azores for a scheduled stopover. The aircraft was destroyed, with the loss of all on board, resulting in the worst plane crash in Portugal s history. Accident During final approach to Santa Maria Airport, the air traffic controller instructed the crew to descend to convert 3000 ft m for an Instrument Landing System ILS approach to runway 19. During that transmission, a trainee controller had also transmitted an incorrect QNH barometric altimeter setting that was 9 hPa too high. The approach instructions were not fully heard since the pilot had re keyed his microphone to acknowledge the new QNH, and likely did not hear the second repeat of the 3,000 ft safe altitude, declaring We re re cleared to 2,000 feet... 610 m . Although the First officer civil aviation first officer questioned the barometric altitude, the Captain civil aviation captain agreed that the first officer ? he, the captain? had heard the read back correctly. After having been cleared to the ILS approach, the crew failed to accomplish the approach briefing, missing an opportunity to notice the 3,000 ft minimum safe altitude and the presence of Pico Alto. Leveling off ... more details
List of acronyms disclaimer qualifier that begin with the letter Q List of acronyms and initialisms Main list of acronyms and initialisms CompactTOCprefix prefix Q NOTOC Q0 9 Q1 disambiguation Q1 p First Quarter Q2 disambiguation Q2 p Second Quarter Q3 disambiguation Q3 p Third Quarter Q4 disambiguation Q4 p Fourth Quarter QA QA disambiguation QA s Qatar FIPS 10 4 country code ISO 3166 digram Qantas a Queensland And Northern Territory Aerial Services QAP disambiguation QAP a Quadripartite Advisory Publication kwapp QAR s Qatari Qatari riyal rial ISO 4217 currency code Qat disambiguation QAT s Qatar ISO 3166 trigram QB QB disambiguation QB p Quarterback football QC QC disambiguation QC i quality control Quality Control s Qu bec postal symbol i Queen s Counsel QCA disambiguation QCA i Qualifications and Curriculum Authority Quality Council of Alberta QCD disambiguation QCD p quantum chromodynamics Quantum ChromoDynamics QD QD disambiguation QD i quaque die Latin, daily QDOS disambiguation QDOS p Quick and Dirty Operating System cue doss QDR i Quadrennial Defense Review QDRO a Qualified domestic relations order quad ro QE QED disambiguation QED p quantum electrodynamics i quid es demonstrata or Q.E.D. quod erat demonstrandum Latin, that proves it or which was to be demonstrated QEH disambiguation QEH i Queen Elizabeth s Hospital QF QFE disambiguation QFE i Quoted For Emphasis s Local ground level atmospheric pressure aeronautical Q code QI QID i lang la quater in die Latin, four times daily QIP disambiguation QIP a Quadrilateral Interoperability Programme ancestor of MIP quip QK QK disambiguation QK s Air Canada Jazz IATA airline designator QL QLD p Queensland , Australia postal symbol QM QM disambiguation QM i Quality Management Quantum Mechanics Queen Mother QN QNH s Regional mean sea level atmospheric pressure aeronautical Q code QP QPR i Queens Park Rangers F.C. English football team i Quality Price Ratio wine evaluation term QPS disambiguation QPS i Quark Pu ... more details
Infobox Airliner accident name SA de Transport A rien SATA Flight 730 Crash image HB ICK.jpg Image caption HB ICK taking off from Geneva, 2 years earlier Date December 18, 1977 Type Pilot error occurrence type Accident Aircraft Damage Destroyed Site Funchal , Portugal Fatalities 36 Aircraft Type Sud Aviation Caravelle Sud Aviation SE 210 Caravelle 10R Operator SA de Transport A rien SA de Transport A rien SATA Tail Number HB ICK Passengers 52 Crew 5 Survivors 21 SA de Transport A rien Flight 730 , tail number HB ICK, was a Sud Aviation Caravelle Sud Aviation SE 210 Caravelle 10R aircraft that crashed on approach to Funchal Airport , Madeira on December 18, 1977. The flight crew consisted of two captains. The pilot in command had never previously landed at Funchal and was being trained to operate from the notoriously difficult airport by the other, more experienced captain, who was acting as co pilot. The training was intended to take place during daytime, but due to a delay the aircraft reached its destination after dark. The non scheduled flight departed from Zurich, making its first stop at Geneva International Airport Geneva Cointrin International Airport at 14 30 UTC. While at Geneva, the aircraft s departure to Funchal was delayed due to a hydraulic pump failure, and it finally took off at 16 26. At 19 38, the crew contacted Madeira control tower, reporting Rose Point at convert 33000 ft , and were cleared to descend to convert 5000 ft abbr on . At 19 55, the crew reported overflying Porto Santo island at convert 8500 ft abbr on and were instructed to continue their descent to 5000 ft and then to contact Funchal approach control. At 19 57, Funchal cleared the crew to descend to convert 3500 ft abbr on and informed them that the QNH was 1014.0 mb. Apparently, during the landing checklist, the crew forgot to set the altimeter to that value, and proceeded to the final 180 turn to the downwind leg well below the correct altitude, losing sight of the runway lights. ... more details
Infobox Airliner accident name Britannia Airways Flight BY226A Crash image britannia.b757 200.g byay.arp.jpg Image caption A Britannia Airways Boeing 757 200 similar to G BYAG Date 14 September 1999 Type Destabilised approach occurrence type Accident Site Girona , Spain Fatalities 1 Injuries 43 2 serious Aircraft Type Boeing 757 Boeing 757 204 Operator Britannia Airways Tail Number G BYAG Passengers 236 Crew 9 Survivors 245 Britannia Airways Flight BY226A was an international charter flight from Cardiff , Wales , UK , which crashed on landing at Girona Costa Brava Airport Girona Airport , Spain , on 14 September 1999 and broke apart. Of the 236 passengers and 9 crew on board, two were seriously injured and 41 sustained minor injuries. One of the passengers who had apparently sustained only minor injuries died five days later of unsuspected internal injuries. The Boeing Boeing 757 757 204 aircraft, Aircraft registration registration G BYAG, was damaged beyond economic repair and scrapped. ref cite web url http www.fomento.es NR rdonlyres 88971AA3 A440 4E12 A167 63114D2D1DCB 2433 1999 054 A texto ENG.pdf title Final report publisher CIAIAC Spanish Investigation Commission accessdate 2009 07 17 ref Flight history The holiday charter flight was landing at night, through thunderstorms with heavy rain at 21 47 UTC 23 47 local . Several preceding flights had diverted to Barcelona International Airport Barcelona and this was planned as BY226A s alternate. The weather prior to the landing approach was reported as blockquote Surface wind 350 6 kt, visibility 4 km, thunderstorm with heavy rain, cloud 3 4 okta octas at 1,500 feet, 1 2 octas cumulonimbus at 3,000 feet, 5 7 octas at 4,000 feet, temperature 20 C dewpoint 20 C, QNH 1010 mb, remarks recent rain. blockquote Accident sequence The crew initially executed the VHF omnidirectional range VOR Distance Measuring Equipment DME non precision instrument approach procedure to runway 02. Upon becoming visual, the crew determined ... more details
Indicated altitude is the reading on the altimeter when the altimeter is set to the QNH local barometric ... the radio as altitude . see QNH ref name CAP413 cite book date 1 January 1995 title Radiotelephony ... more details
Encyclopedia
top
