Hey Guys,

 

first let me make it clear that I disabled all failures in the PMDG menu, so that shouldn't be the reason.

I've encountered the following problem quite recently on two flights (YBBN-KLAX and PHNL-KLAX) while on the approach on RWY 6L and 7R.

As soon as I lower the landing gear I get a "HYD 3 PRES LO" (see attached screenshot) message thus preventing me from lowering the nose and main landing gears, only the center one comes down. If I follow the abnormal procedure to repressurize system 3 nothing happens and I'm forced to follow the "HYD 3 FAIL" procedure. After that I was able to safely land the aircraft in LAX both times.

 

That seems rather strange because I followed the checklist from startup to shutdown just as I always did. On a short test flight from KLAS to KSAN everything worked like a charm. The only reason I see would be that I was speeding up my sim to 4x, which may caused a kind of "hiccup" with the MD-11. Could that be possible? But then again, I was flying other routes with 4x as well, without these issues.

 

Moreover I'm getting the same "ILS untunable" message (not visible in the screenshot) as this guy:

http://forum.avsim.net/topic/280245-landing-gear-failure/?p=1740748

As you can see I'm already within 10 NM of KLAX, so it should be able to tune the ILS without problem, right?

 

Some other guys with the same problem, but without a proper solution:

http://forum.avsim.net/topic/386717-failures-problem/

http://forum.avsim.net/topic/329073-landing-gear-failure/

 

Can you confirm that this is a typical consequence of using higher simulation rates in FSX with the MD-11?

Hope some of you guys can tell me what's the reason behind this kind of behaviour, because I'm beginning to doubt my airmanship :huh:!

 

Eric

 

 

Ok I just did another testflight from EDDF to UNKL, again sped up to 4x. No issues this time except I noticed that the 3rd party gauge "bethere" I'm using turned off and on while inflight, which suggests a temporary loss of FSX-battery power (on the flights mentioned above it went off completely without turning on again -> FSX-battery was dead). Im inclined to say that the HYD 3 PRES LO is indeed caused by some internal FSX struggles (battery), or the MD-11 systems having trouble to keep up with the high simulation rate.  Why it especially happened in KLAX is beyond my imagination. Anyway, as long as I can still complete my flight by following the abnormal procedures, I'm fine with that.

 

Eric

If you are not using some software, like FSpassengers and disbaled all failures, then time acceleration should be only possibilty, that makes this kind of trouble. Accelerating time usually gets you in trouble with PMDG aircrafts, except T7. 

 

ILS untunable is a different issue. Could it be, that scenery navaids were in a disagreement with what you have in the AIRAC data? When this happens, just pause sim, open the FSX map and see if the ILS freq. in FSX is the same what your NAV RAD page is trying to tune.

Hey ho,

 

it's me again. I found the reason behind all this inconveniences: It was the internal FSX-battery (not the MD-11's) that turned itself off somehow and caused the issues with the landing gear (HYD 3 PRES LO) and the ILS UNTUNABLE. Obviously the high simulation rate and a resulting conflict between the complex PMDG systems and the FSX-internals was the origin of all that.

 

Solution: Map a Hotkey (e.g. via FSUIPC) to "Toggle Master Battery" to turn it on again.

 

Cheers,

Eric