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| QW 757 ILS problem! | |
Isak Kindgren   13th May 2011 07:38:08 | Hello guys,
I have two problems with the ILS system on the QW 757-200 passenger model. First one: When flying on the glide you sink rate is around -900ft/min. It's around that on all my aircraft and I guess it's the normal? Anyway the QW 757 even tho I'm flying perfectly on the glide gives me a callout like "dont sink, dont sink"? What am I doing wrong? is there a way to delete this Don't sink message? Second one (which is fare more serious) is that I always seem even when I enter the ILS as it sais on the chart (most often at 2500ft) to end up being a few 100ft's below the glide. I know this may cause the Dont sink warning, other things may be like my speed(135 kts for the landing). Why do I end up below the glide? That results in that I have to disengae the A/T and the AP because otherwise I would hit the ground 100ft before the rwy threshhold! Can anyone help me? Maybe I've setted the altimiter (QNH) wrong? Good news is that I got my Ipad 2 yesterday and just used charts for my flight! Awesome, as someone said It's like having your own kneeboard. Btw, does anyone know where I can get checklists? I don't like those original FSX checklist! |
Dave Wave   13th May 2011 08:46:21 | Altimeter is not a factor on the glide.
Sounds like you are too slow or too heavy. Of couse it could be that the QW757 just isn't coded very well! |
| Isak Kindgren 13th May 2011 08:55:47 | Okey thanks Dave, next flight I will be a bit lighter and a little bit faster on the approach! |
Christian Smith  13th May 2011 13:24:19 | The descent profile is generally 320FT per nm. (3 degree glide path). Your sink rate should be around 850 ft per minute for an approach speed of 160kts. The slower the speed to slower the descent rate... the greater speed means your starting to fall not glide hence 'SINK RATE!'
Secondly you are most likely 'catching the glide' to early. Based on a 3 degree glide path, at 2, 500ft, you would not expect to catch the glide until just under 8 miles from touch down. At which point, 'long approach'(Gear safe) speed is set and gear lowered, in order to maintain an appropiate, yet safe, descent. Often in FSX this is when people set 140 kts- if your doing this then its not good- as Dave said pull up the speed a tad, should your engines fail you should still be able to land so bare this is mind. Your AP should always be attempting to ensure it is established correctly, and compensating if your too high or too low, so allow the aircraft to do the work whilst yo concentrate on speed. If you can get a checklist with the maximum flaps and gear speeds, this should help you determine when to reduce the speed of the aircraft. Should you let an ILS on FSX Land it will usually take you to the numbers, remember this is not the touch down area.. so aim for that instead something like: _ - - -_- For future, try a longer approach, establishing at 210kts, and you should find your self well under the glide. The charts themselves are often based on Feet AGL (Otherwise it would call '500 feet' can you'd be slamming into the runway). Approaching a Glide Slope at 2500ft is often below the full range of the glide and hence your altimeter should not be too much of a concern, but should be set on local QNH to ensure that the callouts match your indicated altimeter (plus ground level) Checklists are pretty bad.. often payware gives you good ones- which include information about appropiate landing speeds and approach speeds based on weight- thank god for wilco. Here is a link for some generic checklists that will do the job too: http://freechecklists.net/simchecklists.asp |
| Isak Kindgren 13th May 2011 18:10:18 | Thank you for your answer Christian, I will try everything you wrote! When it comes to the checklist I will have a look!
Thanks again! |
| Isak Kindgren 14th May 2011 05:33:48 | Thank you Christian and Dave, followed your advices and came in with 2 white and 2 red on the PAPI, the things that I did was to change my payload to around 50 percent and maintained an approach speed around 155kts until 4dme. No warning signals like sinkrate or don't sink. Excellent. I remember when flying VATSIM that you often get this instructions at busy airports like "EXS348, maintain speed 155 (or anything else) until 4 dme". Well once again thank you! Btw, does anyone know when the Captain Sim Boeing 777 will be released? The 777 and the 757 are my favourite aircrafts!
-Isak Kindgren |
Steff Missot 14th May 2011 20:25:26 | Isak also, in real-life they dumb fuel to be lighter on approach;) |
| Christian Smith 14th May 2011 21:18:21 | No probs Isak!
Another happy customer! http://www.captainsim.com/products/x777/200/ |
| Isak Kindgren 15th May 2011 07:27:45 | They dump fuel? Just if they have or what?:) |
| Isak Kindgren 15th May 2011 07:28:22 | Have to*
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| Steff Missot 17th May 2011 14:58:14 | Yep they dumb fuel to get under the maximum landing weight
Pilots always take a little bit more just in case. if the flight goes right with no delays they have to dumb some fuel to be lighter. When there are delays pilots also know that there is a possibility to get in a hold or something else |
| Mick McG 17th May 2011 20:31:46 | Hi Steff,
Just to avoid confusion here, pilots do NOT routinely dump fuel. Fuel dumping is an emergency procedure that is only performed when an aircraft is required to land but is above its safe landing weight. In the UK, fuel dumping will take place over water and ususally not below 10000ft. In exceptional circumstances dumping fuel overland may be permitted but there are restrictions (eg, not below 7000ft agl in winter/ 4000ft agl in summer and vertical separation of not less than 1000ft above any other aircraft ). For fuel to be jettisoned below these levels the situation must be unavoidable. Airline pilots plan their flights to arrive with sufficient fuel on board to hold for at least 30 minutes at the destination aerodrome before diverting to a nominated diversion airport and make a safe landing following a missed approach there. Hope this makes sense. Look forward to being back flying/controlling in a few weeks. Regards to all, M |
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