Narrative:

At departure time for flight. WX at dfw was M9 ovc 3RF. This was the first flight for this aircraft on this date. Aircraft maintenance release was signed in the aircraft logbook. Preflight inspection was completed. At time of preflight it was raining and there was approximately 1/4' to 1/2' of standing water on the ramp. The interior and exterior inspection of the aircraft appeared to be normal and routine. The flight proceeded as follows: takeoff phase, normal. Climb phase, 0-10000 ft MSL. Airspeed, normal. Altimeter, indicated a climb but appeared to have an intermittent lag followed by an instant increase of about 100 ft-200 ft increments. Climb phase, 10000 ft MSL,FL330. Climb to FL330 was flown with intermediate level off's at 10000 ft MSL and FL230. Cruise phase: leveling at FL330 the altimeter continued to climb. Alternate static source was selected. The altimeter began to descend, airspeed began to increase, and the ivsi indicated a 6000 FPM descent. A return to the normal static source was initiated; the ivsi returned to zero, airspeed began to decrease, but the altimeter only returned to an altitude of FL30.8. ATC was advised of the problem. Thee was no accurate indication to determine the altitude of the aircraft and ATC was only indicating the mode C indications from our altimeters. ATC issued a clearance for a 'block altitude' of FL290 to FL350. A landing at a VFR airport was essential. Ind was selected: WX 150 ovc 7H. ATC issued a 'cruise 3000 ft' clearance. Descent phase: airspeed increased to above the limit of the airspeed indicator. Mach overspd warning sounded until the circuit breaker was pulled out. Radar vectors were provided by ATC. Vectored over the top of airport an initiated a right downwind for a landing on runway 5R at ind. On landing in ind altimeters indicated above FL200. Ivsi indicated a descent. Airspeed indicated above mach 1.0. Cause: all static ports; except the static ports used for pressurization, were taped over with a thin white cloth adhesive tape. Factors: airplane was washed the night before the incident. Air carrier procedures were not adhered to in anyway. Airlines maintenance was not advised that the static ports were taped. A non approved tape was used to cover the static ports.

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Original NASA ASRS Text

Title: ERRATIC AND ERRONEOUS ALTIMETER AND AIRSPEED READINGS IN CLIMB AND CRUISE OUT OF DFW. EMERGENCY LNDG AT IND. STATIC PORTS HAD BEEN TAPED OVER FOR ACFT WASH. MISSED ON PREFLT.

Narrative: AT DEP TIME FOR FLT. WX AT DFW WAS M9 OVC 3RF. THIS WAS THE FIRST FLT FOR THIS ACFT ON THIS DATE. ACFT MAINT RELEASE WAS SIGNED IN THE ACFT LOGBOOK. PREFLT INSPECTION WAS COMPLETED. AT TIME OF PREFLT IT WAS RAINING AND THERE WAS APPROX 1/4' TO 1/2' OF STANDING WATER ON THE RAMP. THE INTERIOR AND EXTERIOR INSPECTION OF THE ACFT APPEARED TO BE NORMAL AND ROUTINE. THE FLT PROCEEDED AS FOLLOWS: TKOF PHASE, NORMAL. CLB PHASE, 0-10000 FT MSL. AIRSPD, NORMAL. ALTIMETER, INDICATED A CLB BUT APPEARED TO HAVE AN INTERMITTENT LAG FOLLOWED BY AN INSTANT INCREASE OF ABOUT 100 FT-200 FT INCREMENTS. CLB PHASE, 10000 FT MSL,FL330. CLB TO FL330 WAS FLOWN WITH INTERMEDIATE LEVEL OFF'S AT 10000 FT MSL AND FL230. CRUISE PHASE: LEVELING AT FL330 THE ALTIMETER CONTINUED TO CLB. ALTERNATE STATIC SOURCE WAS SELECTED. THE ALTIMETER BEGAN TO DSND, AIRSPD BEGAN TO INCREASE, AND THE IVSI INDICATED A 6000 FPM DSNT. A RETURN TO THE NORMAL STATIC SOURCE WAS INITIATED; THE IVSI RETURNED TO ZERO, AIRSPD BEGAN TO DECREASE, BUT THE ALTIMETER ONLY RETURNED TO AN ALT OF FL30.8. ATC WAS ADVISED OF THE PROB. THEE WAS NO ACCURATE INDICATION TO DETERMINE THE ALT OF THE ACFT AND ATC WAS ONLY INDICATING THE MODE C INDICATIONS FROM OUR ALTIMETERS. ATC ISSUED A CLRNC FOR A 'BLOCK ALT' OF FL290 TO FL350. A LNDG AT A VFR ARPT WAS ESSENTIAL. IND WAS SELECTED: WX 150 OVC 7H. ATC ISSUED A 'CRUISE 3000 FT' CLRNC. DSNT PHASE: AIRSPD INCREASED TO ABOVE THE LIMIT OF THE AIRSPD INDICATOR. MACH OVERSPD WARNING SOUNDED UNTIL THE CB WAS PULLED OUT. RADAR VECTORS WERE PROVIDED BY ATC. VECTORED OVER THE TOP OF ARPT AN INITIATED A R DOWNWIND FOR A LNDG ON RWY 5R AT IND. ON LNDG IN IND ALTIMETERS INDICATED ABOVE FL200. IVSI INDICATED A DSNT. AIRSPD INDICATED ABOVE MACH 1.0. CAUSE: ALL STATIC PORTS; EXCEPT THE STATIC PORTS USED FOR PRESSURIZATION, WERE TAPED OVER WITH A THIN WHITE CLOTH ADHESIVE TAPE. FACTORS: AIRPLANE WAS WASHED THE NIGHT BEFORE THE INCIDENT. ACR PROCS WERE NOT ADHERED TO IN ANYWAY. AIRLINES MAINT WAS NOT ADVISED THAT THE STATIC PORTS WERE TAPED. A NON APPROVED TAPE WAS USED TO COVER THE STATIC PORTS.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.