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Old 2nd Jun 2007, 11:22   #1 (permalink)
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Unserviceabilities with Unusual Symptoms ..

Compressor Stall has suggested this thread and my guess is that all our Tech Log folk will support it.

Aim is for PPRuNers who have seen odd symptom U/S situations to put them here with the outcome. That way all who fly that Type can benefit ie -

(a) nominate aircraft type

(b) describe the symptoms observed

(c) describe what the problem and/or fix was.


Stallie gives the first example which I have copied to the body posts -

(a) B200

(b) airborne ASI drops by 50 knots but returns to normal on landing

(c) leaking ASI face.


Clearly this would apply generally so I'll have a general U/S post as well.


We'll see how the thread progresses but my idea at this stage is to collate posts on the one Type/Model so that it is easy for those on Type/Model to find material relevant to their interests. As with the URL sticky, I'll have no hesitation in pinching examples from other places ...

If a given post needs to lead into more detailed discussion, I'll leave the basics here and split the discussion off into another thread .. that way this thread becomes a reference information thread only.

As there are post length limits, I'll set up several dummy General posts to reserve the first few posts for non-specific problems and do likewise with a dummy post for each Type/Model so that we can delay the inevitable of having to leapfrog through the thread to track all entries for a given Type/Model.

Unfortunately there is no way of which I am aware to reorder posts periodically (and simply) so we will need to use the index post to keep track of multiple entries for a given Type/Model as the thread develops .. shouldn't make it too terribly difficult for folk to follow. Occasionally, when I'm bored to tears .. I might just reorder the posts to approximate an alphabetical listing.

As with the URL sticky, I'll delete individual posts after the content is transferred to the Type/Model post and, periodically, remove empty posts from the thread to keep things a bit tidier.

Please be patient if there are delays in this latter part of the gameplan .. we mods also have our day jobs which occasionally divert and distract us from our real work of PPRuNeing ...


Caveat: PPRuNe does not warrant the correctness or appropriateness of any post, or post entry, in this thread. Posts are provided as information only for PPRuNer background and familiarisation. PPRuNe does not recommend nor encourage any procedure which is not specified in approved operational or maintenance documents.


Credits: A4, bugg smasher, Compressor Stall, craig freier, IFixPlanes
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Old 2nd Jun 2007, 11:28   #2 (permalink)
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Index

Post Subject Aircraft

003 General

020 Airbus A320 Series (318/319/320/321)
008 Beechcraft B200
010 Boeing 737 Classic
012 Boeing 737 NG
014 Boeing 747
016 Boeing 757/767
018 Boeing 777
022 MD10/MD11
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Old 2nd Jun 2007, 11:30   #3 (permalink)
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General Post 1

ASI - reading airborne drops by 50 knots but returns to normal on landing.
U/S: leaking ASI face.
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Old 2nd Jun 2007, 11:33   #4 (permalink)
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General Post 2

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Old 2nd Jun 2007, 11:37   #5 (permalink)
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Old 2nd Jun 2007, 11:37   #6 (permalink)
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Old 2nd Jun 2007, 11:38   #7 (permalink)
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Old 2nd Jun 2007, 11:42   #8 (permalink)
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Beechcraft B200

ASI - reading airborne drops by 50 knots but returns to normal on landing.
U/S: leaking ASI face.
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Old 2nd Jun 2007, 11:46   #9 (permalink)
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Beechcraft B200

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Old 5th Jun 2007, 21:15   #10 (permalink)
 
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Boeing 737 Classic

Speed trim fail light illuminates with master caution and flt ctl. Speed lim amber warning on captain's PFD. Left N1 gauge fails.
U/S: N1 C/B tripped
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Old 5th Jun 2007, 22:23   #11 (permalink)
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Boeing 737 Classic

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Old 5th Jun 2007, 22:27   #12 (permalink)
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Boeing 737 NG

Trouble shooting on gear retraction after lift off - Trip C/B "ALTN EXTEND SOL" (P6-3 D16). If gear now will retract, the microswitch has defectively switched to "access door open" (normally caused by dirt). Make a log book entry and finish your flight. Donīt forget to reset the C/B or move the gear lever to OFF before manual extension. For further detail refer to this thread

Note only
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Old 5th Jun 2007, 22:31   #13 (permalink)
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Boeing 737 NG

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Old 5th Jun 2007, 22:34   #14 (permalink)
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Boeing 747

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Old 5th Jun 2007, 22:35   #15 (permalink)
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Boeing 747

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Old 5th Jun 2007, 22:37   #16 (permalink)
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Boeing 757/767

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Old 5th Jun 2007, 22:38   #17 (permalink)
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Boeing 757/767

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Old 5th Jun 2007, 22:39   #18 (permalink)
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Boeing 777

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Old 5th Jun 2007, 22:40   #19 (permalink)
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Boeing 777

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Old 5th Jun 2007, 22:41   #20 (permalink)
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Airbus A320 Series

A319

After 2nd engine start, ECAM HYD BLUE SYS LO PR. HYD Page shows 3000 PSI (normal) but F/CTL Page shows B for all BLUE system components (abnormal). So contradictory indications for BLUE system.

Previous night the engineers had tested the RAT (BLUE system..) and had left the leak measurement valves in the open position i.e. selected "ON" on the maintenance panel (on the o/head panel towards rear of flightdeck). The aircraft had then been depowered with valves in the maintenance position. On power up the lights on the panel were not noticed (apparently they will be on).

Fix: Deselection of LMV returns system and all indications to normal.
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