Re: Peruvian 757 crash -- possible cause reported

From:         Mit Robertson <cmr7g@faraday.clas.virginia.edu>
Organization: uva
Date:         08 Nov 96 05:24:23 
References:   1
Followups:    1
Next article
View raw article
  or MIME structure

>The media has been reporting that a possible cause has been
>identified for the October 2nd crash of AeroPeru flight 603, into the
>Pacific Ocean near Lima,
[snip.]

>Reportedly, maintenance crews placed duct tape over the static
>ports (which feed the airspeed, altitude indicators, and verticle
>speed indicators) to protect them during "polishing" of the aircraft,
>then forgot to remove the tape.

>This would explain the complete instrumentation failure, though
>it fails to explain why the pilots did not recognize a problem
>with the airspeed indicator during takeoff and either abort
>the takeoff...

The static port only provides a source ambient outside air
pressure with which the airspeed indicater, altimeter, &
vertical speed indicator make their measurments.  On the
ground, it doesn't matter (much) if the ports are stopped.
They air trapped inside is still at the ambient pressure.  So
there wouldn't have been any ill efects observable early
enought to abort a takeoff.  Depending on the weather, a return
to the airport might have been impossible as well.  Nonetheless,
there's very little excuse for crashing into the ocean.