B737-700 crew did not contact the tower when advised, because of distraction caused by a 5 KT airspe...

Attributes
ACN	583182
Time
Date	200305
Day	Tue
Place
Locale Reference	airport : mia.airport
State Reference	FL
Altitude	msl single value : 2000
Aircraft 1
Controlling Facilities	tracon : mia.tracon tower : mia.tower
Operator	common carrier : air carrier
Make Model Name	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	descent : approach
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : instrument pilot : commercial
ASRS Report	583182
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Events
Anomaly	aircraft equipment problem : less severe other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : air speed indicator other controllera
Resolutory Action	controller : issued advisory controller : provided flight assist controller : issued new clearance
Consequence	other other
Supplementary
Problem Areas	Aircraft Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance

Narrative:

Late frequency change. Approach control asked us to slow early to accommodate departures. After receiving the frequency change to tower I noticed the airspeed was slow 5 KTS, at vref 40 KTS instead of vref 40 KTS +5 KIAS. I set the tower frequency, but did not change the active frequency in the selector window. I notified the captain that we were 5 KTS slow. I continued to monitor departure and arrival traffic and then notice the airspeed was vref 40 KTS -5 KIAS (10 KTS slow). The captain and I discussed the discrepancy and crosschecked airspeed indicators. He said his pfd and HUD agreed and were 5 KTS higher than my pfd. We then got a call from approach telling us that tower was looking for us. We switched over to 118.3 and were given a landing clearance, and landed without incident. The captain made a logbook entry for the airspeed discrepancy.

Original NASA ASRS Text

Title: B737-700 CREW DID NOT CONTACT THE TWR WHEN ADVISED, BECAUSE OF DISTR CAUSED BY A 5 KT AIRSPD DISCREPANCY.

Narrative: LATE FREQ CHANGE. APCH CTL ASKED US TO SLOW EARLY TO ACCOMMODATE DEPS. AFTER RECEIVING THE FREQ CHANGE TO TWR I NOTICED THE AIRSPD WAS SLOW 5 KTS, AT VREF 40 KTS INSTEAD OF VREF 40 KTS +5 KIAS. I SET THE TWR FREQ, BUT DID NOT CHANGE THE ACTIVE FREQ IN THE SELECTOR WINDOW. I NOTIFIED THE CAPT THAT WE WERE 5 KTS SLOW. I CONTINUED TO MONITOR DEP AND ARR TFC AND THEN NOTICE THE AIRSPD WAS VREF 40 KTS -5 KIAS (10 KTS SLOW). THE CAPT AND I DISCUSSED THE DISCREPANCY AND XCHKED AIRSPD INDICATORS. HE SAID HIS PFD AND HUD AGREED AND WERE 5 KTS HIGHER THAN MY PFD. WE THEN GOT A CALL FROM APCH TELLING US THAT TWR WAS LOOKING FOR US. WE SWITCHED OVER TO 118.3 AND WERE GIVEN A LNDG CLRNC, AND LANDED WITHOUT INCIDENT. THE CAPT MADE A LOGBOOK ENTRY FOR THE AIRSPD DISCREPANCY.

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.

B737-700 crew did not contact the tower when advised, because of distraction caused by a 5 KT airspeed discrepancy.