External inspection

Date:         30 Nov 98 03:08:00 
From:         stephan@lac.inpe.br (Stephan Stephany LAC-CC)
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Concerning an airliner, who is in charge of
the external inspection? The PIC/1st officer
or some people from ground staff?

Concerning the AeroPeru 757 crash (2/10/96):

"Flight 603 took off from Lima Runway 15 at 12.42h am for a flight to
 Santiago. Five minutes after take-off the crew reported problems with
 their instruments and stated they wanted to return to the airport.
 During the initial climb, the airspeed and altitude indications were
 too low. In calm winds, the windshear warning suddenly sounded. The
 aircraft climbed to FL130, before a return to Lima was initiated. While
 returning, the captain's airpeed and altitude indications were too
 high, causing an overspeed warning. At the same time, the co-pilot's
 airspeed indications were too low, triggering the stickshaker.  The
 aircraft kept descending and impacted the water with the left wing and
 no.1 engine at a 10 degrees angle, at a speed of 260kts. The aircraft
 pulled up to about 200ft and crashed inverted. The captain's airspeed
 indicated 450kts and altitude 9500ft. The aircraft had flown approx.
 2630 cycles. Preliminary investigation results showed that the
 aircraft's three static ports on the left side were obstructed by
 masking tape. The tape had been applied before washing and polishing of
 the aircraft prior to the accident flight."

The crew had no clue of altitude or airspeed (also the "backup" system
was inoperative), but just out of curiosity: could some pressure
indicator (if there is any) of the pressurization system had given to
the crew an idea of the outside pressure and (in consequence) of the
real altitude?



Dr. Stephan Stephany
phone +55 12 345-6547
LAC  - Computing and Applied Mathematics Laboratory
INPE - Brazilian Institute for Space Research