Det er et meget godt spørsmål !Hvis MAX9 er mindre utsatt for nose up enn MAX8, hva da med MAX7 som er kortere?
7263 61374 B-206L 737-8 9Air
7346 61142 B-208J 737-8 Shenzhen Airlines
7351 63276 B-208E 737-8 China Southern
7420 60434 ZS-ZCB 737-8 Comair Limited
7424 60223 VT-MXL 737-8 SpiceJet
7425 44568 TF-ICB 737-9 IcelandAir
7429 60134 OK-SWJ 737-8 Smartwings
7436 44251 9V-MBG 737-8 Silk Air
7438 63358 A4O-MF 737-8 Oman Air
7450 43917 UR-MXA 737-8 Ukraine International Airlines
En United 739 er fløyet til Aradiana ved New Orleans, muligens for lakkering til de nye fargene som ryktes å være på vei?
From Pprune, citing Aviation Week & Space Technology magazine March 25-April 7,2019, pages 16-18:
Quote:
FAA Reviews Enhanced MAX Flight-Test Data
Guy Norris Los Angeles
Boeing has completed a key certification flight test of enhanced 737 MAX flight-control computer software, marking a major step toward returning the grounded fleet to service.
The test flight, conducted using the first 737-7 variant of the MAX, validated a set of updates to the Maneuvering Characteristics Augmentation System (MCAS) flight control law as well as improved pilot displays. Although the changes are part of a set of upgrades developed in the aftermath of the Lion Air Flight 610 accident in 2018, they are also expected to address a similar set of control problems implicated in the crash of Ethiopian Airlines Flight 302 this month.
Boeing says it has been “working closely with the FAA on development, planning and certification of the software enhancement, and it will be deployed across the 737 MAX fleet in the coming weeks.” It adds, “The update also incorporates feedback received from our customers.” The FAA is expected to mandate the enhancement with an airworthiness directive at the end of March.
Although the company will not comment on the current status of flight tests, or say whether they have concluded, Boeing Chairman and CEO Dennis Muilenburg says: “[W]hile investigators continue to work to establish definitive conclusions, Boeing is finalizing its development of a previously announced software update and pilot-training revision that will address the MCAS flight control law’s behavior in response to erroneous sensor inputs.”
The software upgrade package, known as the EDFCS (enhanced digital flight control system), significantly modifies the MCAS that was introduced on the MAX to match aircraft-handling characteristics with those of the 737 Next Generation and decrease pitch-up tendency at elevated angles of attack. The MCAS changes are focused on three areas: improving activation logic, enhancing angle-of-attack (AOA) inputs and limiting stabilizer-command authority.
Boeing says the changes are designed to increase overall system redundancy, limit stabilizer trim commands in response to an erroneous AOA reading and retain elevator authority by limiting the degree of stabilizer command. The company is not yet detailing how the changes are being implemented. For example, Boeing has not clarified whether the AOA changes include adding more sensors or, as is considered more likely, revising the MCAS architecture to enable data from both the AOA vanes in the current configuration to be fed into both flight control computers.
A key modification to limiting stabilizer commands is a revision that allows only one trim application for each new trigger of the MCAS system. Under the original design, the MCAS trims the aircraft nose down by moving the horizontal stabilizer up at 0.27 deg./sec. for 9.2 sec., stops for 5 sec., then trims nose down again for 9.2 sec., and continues to do so until the trim reaches the stabilizer travel limit or the crew intervenes. Boeing says that, as before, the crew will retain the capability to override the flight control law using either electric or manual trim, or by following the existing runaway stabilizer procedure and using the cutout switches as reinforced in the Operations Manual Bulletin issued on Nov. 6, 2018.
(...) cf Pprune, citing AW&ST
Along with the MCAS changes, Boeing also is updating training requirements and flight-crew manuals. The company declines to comment on reports in The Wall Street Journal that Boeing and the FAA have struggled to agree on the extent of some of these changes, particularly regarding the revised training procedure. Alterations are planned for the Airplane Flight Manual and Flight Crew Operations Manual, as well as new notes for the speed trim fail checklist in the Quick Reference Handbook. Other changes are being made to the Airplane Maintenance Manual and the Interactive Fault Isolation Manual.
Boeing has outlined updated training documents to advise pilots of the changes as well, but according to the Journal, the FAA has pushed for more extensive training, including a self-guided computer-based instruction course.
Jeg tror ikke at det er journalistene som er problemetSelvfølgelig er det ikke vanskelig for journalister å finne arbeidere som synes de har jobbet for mye - Skulle bare mangle - Men de gode løsningene kommer som regel ikke før du har pistolen mot tinningen. Jeg pleier å si at; hvis du har noe du skal ha gjort, må du gi oppgaven til en som har mye å gjøre. Hva er feil med å jobbe raskt og effektivt? (Einstein hadde sannsynligvis heller ikke funnet ut av relativitetsteorien hvis ikke en av hans kolleger hadde prøvd å komme han i forkjøpet.)
Kvalitetssikring og testing av produkter må jo likevel gjøres før godkjenning.
Måtte bare si det.
De beste flyene er neppe de som tar så lang tid å bygge at de aldri blir noe av.
Pilots from the three American carriers that fly Boeing 737 MAX planes tested software changes developed by Boeing to a key stabilization system on Saturday, a person briefed on the tests said.
Man må adressere problemene og rette feilene, ikke snu seg mot bedriften man jobber i og si at alt er feil. Boeing lager gode fly, og de tar sikkerheten på alvor. Noe annet ville være fullstendig galskap. 1. generasjons MCAS (og info om systemet) var ikke mye å skryte av, men ambulance chasing eller røde journalister som prøver å gi et inntrykk av at alt er gjort for å tjene penger, blir bare slitsomt
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