RA Callouts Not Always Present

[tomenglish2000]

Hi all.

First post on the forum although I have been a member for a while! I always enjoy reading the discussions about this wonderful software.

I have recently been doing a lot circuit training to try and improve my manual handling in general and my landing technique in particular.

Following Peter's tutorial I have been doing 1500' left hand circuits from 27L at EGLL.

Sometimes on approach I receive no RA callouts and other times I do despite being in a BA model where they are programmed ("Radio Altimiter", "1000", "500 if not on G/S", "100", "50", "30", "20", "10", "Fifty Above" and "Decide").

My DH is set to 100' to mimic CATII Manual approach and as I fly around at 1500' on approach I would expect to hear "1000", "500" (G/S Dependent), "Fifty Above", "Decide", "50", "30", "20", "10".

I found this discussion about the 2500' callout that mentions a rearming altitude. Is this causing the problem I am seeing?
http://aerowinx.com/board/index.php?topic=2279.0

On occasions when I do hear the callouts I am certain I have not gone above RA 2000' let alone 2600' so I dont know why they sometimes happen and sometimes do not. Do the lower altitudes have lower re-arming heights?

Please let me know. I find the 30' callout helpful in particular for my flare and thrust reduction.

Thanks.
Tom.

[Hardy Heinlin]

Hi Tom,

all calls except for "2500" are reset when RA is above 1400 ft.

Perhaps you are referring to barometric altitude when flying at 1500 ft? If your lowest elevation point along the circuit is circa 100 ft, you will be close to 1400 RA, maybe sometimes a hair above, or a hair below it. And that hair will determine whether the calls will be reset or not.

When the area is about 100 ft above MSL, you should fly the circuit at 1600 ft baro altitude.


Regards,

|-|ardy

[tomenglish2000]

Hi Hardy.

That is probably what is happening. LHR is about 80' above sea level. My circuit is at 1500' barometric so my RA is about 1400' in the circuit. So sometimes I must be going just above 1400' RA and re-arming it and others I am not. I guess it depends how sloppy my altitude holding is!

I will up the circuits by 100' to make sure it re-arms every time.

Thanks.
Tom.