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Cyrano

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Posts posted by Cyrano

    Guess the plane

    in Aircraft General Discussion

    Posted

    On 24/03/2022 at 1:24 AM, onetrack said:

    An axe for cable cutting shows a complete lack of knowledge of cables. Imagine what a miss during an axe swing, would do to an airframe!

    Almost since steel cables were invented, you could acquire a simple cable cutter that is nothing more than a little guillotine, and they can be operated with a small hammer.

    Hydraulic hand-operated cable cutters have been around since the 1950's - and today, you can even buy battery-drill operated cable cutters.

     

    https://www.youtube.com/watch?v=iERcpgO3e7U

     

    Better option than hitting the airframe with planet earth at great speed...

    • Like 1

    From RAAF to Rec Aviation

    in AUS/NZ General Discussion

    Posted

    I am privileged to have attended one of her talks to a sporting club. Marija is an amazing lady who has overcome many challenges to get where she is today. Highly intelligent, a highly qualified engineer and test pilot. A wonderful immigrant story. Such qualifications don't come easily. Her troops admire and greatly respect her as a Commanding Officer of a P3 Squadron (at the time of writing). There are many people who have met her who would be very disappointed if this discussion were to head down the wrong path.

    • Like 5
    • Informative 1

    Jab down in Wentworth 2 Jan 23.

    in Aircraft Incidents and Accidents

    Posted

    1 hour ago, jackc said:

    Prove intention to operate outside the specs unless the investigation finds beyond a reasonable doubt the the pilot did so.  In respect of Weather conditions, was there a weather station nearby?  Who could prove weather conditions at crash site?  Lots of variables including WHO did the investigation?   I am sure the insurance company would do its best to deny a claim?  Seems to be the way of insurance companies these days…….

    The fact one would consider exposing one's self to such scrutiny reflects poorly on us all. No wonder the insurance premiums are so high. The responsible majority are subsidising the lack of measured forethought of others.

    • Like 1
    • Haha 1

    Similiar speed but different mach numbers?!

    in Aircraft General Discussion

    Posted · Edited by Cyrano

    The speed of sound is purely a function of air temperature. So if you are on the ground in Siberia at minus 60 degrees celsius the speed is the same as minus 60 degrees at say 40,000'.

    From memory the formula is:

    38pointsomething x the square root of the absolute temperature.

    Absolute temp being zero at ~minus 273°.

    Your Mno is the ratio of your true airspeed/local Mno. At sea level and ISA (+15°C) at 250kts indicated your TAS is 250kts and the Mno is 250/661~0.38M.

    As you climb out at 250IAS your TAS will progressively increase (eg+16%@10,000') as the air DENSITY decreases. Assuming a standard atmosphere the local speed of sound will decrease with temperature until it is ~573kts@36,090'-the tropopause where the standard temp is -56.5°C. Typically in the cruise the numbers you will see might be: 36,000'/245KIAS/M0.78/460KTAS

    There is a lot more to the story but I won't bore you with that.

    'Flight planned route.'

    in AUS/NZ General Discussion

    Posted · Edited by Cyrano
    .

    I think ATC gave them a new route to that planned (perhaps MIL airspace) thus the reason for the full readback. In AUS (including WA...! ) If the flight were as planned then only the initial waypoint that joins the airway is needed eg ATC,  "N6BX cleared to Sydney via SEDAN, flight planned route. SEDAN2 departure, climb via the SID 5,000, Squawk 3414, departure freq 118.2

    You read it all back and give your parking position at the end.

    If you are fancy enough to get a PDC the only readback is SID , Squawk code and parking position.

    • Informative 2

    Boeing and Airbus call for safety delay in US 5G rollout. Any knowledgeable comments on this?

    in Instruments, Radios and Electronics

    Posted

    As mentioned the 5G can interfere with radio altimeters on aircraft. Usually there are two fitted. So what you might say but the RADALT signal is intergrated into many aircraft systems. For example it changes the sensitivity to the ILS signal as you get closer to the ground. If both radalts are unserviceable the approach must be flown manually (Airbus) as the autopilot will not receive correct commands as altitude reduces. During autoland operations in low visibility it commands the engine thrust to idle during the flare. If interference occurred from a 5G signal the engines could go to idle at say 2,000' thinking it were in the flare.

     There are dozens of other potential problems but the above gives a taste of the issues!

     

    http://www.alpa.org/resources/aircraft-operations-radar-altimeter-interference-5G#:~:text=Radar altimeter interference from 5G signals can take the form,1951 in Amsterdam in 2009.

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