The A320 Podcast21 Marras 2016

TAP006: OEB48

What is OEB48? Well basically it's an Operations Engineering Bulletin that was issued by Airbus to all operators to cover the possibility of all AoA probes becoming "blocked" which could then cause the aircraft to go into unwanted protections.

FAC computes GW and sends it to the ELAC.
FAC uses aerodynamic data to calculate and display characteristic speeds on the PFD
ELAC computes activation of protections

The reason αprot decreases with mach number is due to two things, compressibility effect and critical mach number. Above about Mach 0.6, Calibrated Air Speed and Equivalent Air Speed diverge due to compressibility effects, meaning CAS over-reads compared to EAS. Airbus and most other aircraft PFDs show CAS on the airspeed tape, so at higher Mach numbers the Vls, aProt and aMax displayed must increase to compensate for the growing difference between EAS and CAS. The other effect is caused by increasing the Mach number into the transonic range. This eventually causes small shockwaves to form on the wing, which grow in size as the flight Mach number and/or AOA increase. These shockwaves disturb the airflow behind them, reducing the lift of the wing compared to subsonic flight conditions for the same AOA. The relationship between CL and AOA are adjusted to compensate. The effect is the stall equivalent airspeed increases because the shockwaves cause CLmax to decrease.
Finally, the shockwaves can also cause the wing to stall at a lower AOA, but this is all dealt with through reduced CLMax and thus higher stall speed.

CAS Link https://en.wikipedia.org/wiki/Calibrated_airspeed

EAS link https://en.wikipedia.org/wiki/Equivalent_airspeed

Critical Mach Number link https://en.wikipedia.org/wiki/Critical_Mach_number

Accident interim report for Lufthansa Accident http://www.bfu-web.de/EN/Publications/Interim_Reports/IR2014/I1_Report_14_6X014_A321_Pamplona.pdf?__blob=publicationFile

www.A320podcast.com

www.facebook.com/A320podcast

Tämä jakso on lisätty Podme-palveluun avoimen RSS-syötteen kautta eikä se ole Podmen omaa tuotantoa. Siksi jakso saattaa sisältää mainontaa.

Jaksot(115)

TAP115: Engine Fire Procedure

In this episode Matt has a look at a case study to highlight the importance of not delaying the implementation of the engine fire procedure. For extra information on the topics covered today you can a...

25 Huhti 202321min

TAP114: Prevention of EGT overlimits

In this episode, Matt looks at EGT overlimits with a case study, background tech, some methods we can use to prevent it as a flight crew and how to deal with it if we experince it. Support the podca...

6 Helmi 202321min

TAP113: Engine Failures with Capt Al

In this episode, Matt is joined by Captain Al as they discuss his personal experience with engine failures. They also give some tips on how to manage engine failures. https://www.facebook.com/Plane-Sa...

18 Huhti 20221h 4min

TAP112: Nosewheel at 90º

In this episode, Matt takes a look at the LATAM incident on the 27th March and then talks about the causes of the other 5 incidents that have happened on the A320 family which resulted in landing with...

4 Huhti 202230min

TAP111: Backup Speed Scale

In this Episode Matt takes a look at the BUSS or Backup Speed Scale plus what Airbus has lined up in the future for helping pilots deal with unreliable speed. We are now running command preparation co...

18 Tammi 202214min

TAP110: Unreliable Speed

The podcast is back!!!! Matt takes another look at the Unreliable Speed procedure, the reasons behind the recent increase in events and some tips on how to deal with them.

17 Joulu 202132min

TAP109: TCAS

We are back!! This week we look at TCAS, its history, how it operates and what the procedures are. We also talk about our new online course! #A320 #Avgeek #pilot #pilotlife #TCAS #Airbus

12 Maalis 202125min

TAP108: Interview with Memory Items App founder

In this episode Matt and Andy talk with Tino from Easy Memory Item about the importance of Memory Items and how you can improve your learning of them. To download the app, search easymemoryitem in t...

5 Loka 202023min