Crj-200 flight crew reported experiencing system failures including airspeed indicator malfunctions ...

Attributes
ACN	1590442
Time
Date	201811
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	Marginal
Light	Daylight
Aircraft 1
Make Model Name	Regional Jet 200 ER/LR (CRJ200)
Operating Under FAR Part	Part 121
Flight Phase	Final Approach Cruise Initial Approach
Route In Use	Vectors
Flight Plan	IFR
Component
Aircraft Component	Pitot-Static System
Person 1
Function	Captain Pilot Not Flying
Qualification	Flight Crew Instrument Flight Crew Air Transport Pilot (ATP) Flight Crew Multiengine
Person 2
Function	First Officer Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Aircraft Equipment Problem Critical Deviation - Track / Heading All Types

Narrative:

Due to pitot-static failure with air data computer (air data computer) failure detected; after following QRH for EFIS comp mon IAS and air data computer 1 failure followed by uncommanded autopilot disengage; it was difficult to see which airspeed indicator was accurate. The isi showed a 55 knot difference than air data computer 1 and 2 at 5;000' MSL; [and] air data computer 1 and air data computer 2 were 10-15 knots different in speed. On approach; we had to hand fly the ILS. During the approach; course deviation and correction was continuous and due to task saturation with the conditions; I [declined] when directed to go around because of the lateral deviation. We had the field in sight and determined it was safer to land than to go back into IMC with airspeed accuracy difficulties. Determined from maintenance that there was water in the pitot static [system].

Original NASA ASRS Text

Title: CRJ-200 flight crew reported experiencing system failures including airspeed indicator malfunctions that were later traced to water in the pitot static system.

Narrative: Due to pitot-static failure with Air Data Computer (ADC) failure detected; after following QRH for EFIS COMP MON IAS and ADC 1 failure followed by uncommanded autopilot disengage; it was difficult to see which airspeed indicator was accurate. The ISI showed a 55 knot difference than ADC 1 and 2 at 5;000' MSL; [and] ADC 1 and ADC 2 were 10-15 knots different in speed. On approach; we had to hand fly the ILS. During the approach; course deviation and correction was continuous and due to task saturation with the conditions; I [declined] when directed to go around because of the lateral deviation. We had the field in sight and determined it was safer to land than to go back into IMC with airspeed accuracy difficulties. Determined from maintenance that there was water in the pitot static [system].

Data retrieved from NASA's ASRS site 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.

Crj-200 flight crew reported experiencing system failures including airspeed indicator malfunctions that were later traced to water in the pitot static system.