Traffic conflicts and malfunctioning navigation systems overload B737-300 flight crew on approach. Fail to complete before landing checklist and have to go around due to landing flaps not selected.

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Attributes
ACN	736744
Time
Date	200704
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : iad.airport
State Reference	DC
Altitude	agl single value : 500
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : iad.tower
Operator	common carrier : air carrier
Make Model Name	B737-300
Operating Under FAR Part	Part 121
Flight Phase	descent : approach
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tower : iad.tower
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	descent : approach
Person 1
Function	flight crew : first officer
Experience	flight time last 90 days : 218 flight time type : 4000
ASRS Report	736744
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Events
Anomaly	aircraft equipment problem : less severe conflict : airborne less severe non adherence : published procedure
Independent Detector	other controllera other flight crewa other flight crewb
Resolutory Action	flight crew : overcame equipment problem flight crew : executed go around
Supplementary
Problem Areas	Flight Crew Human Performance ATC Human Performance Aircraft
Primary Problem	Ambiguous

Narrative:

ATC slowed us to 160 KTS on a 20 mi right base. Aircraft ahead blew through final forcing ATC to pull us off the approach at approximately 4 mi outside of OM. After re-intercepting final and GS capture; captain's airspeed indicator bug froze; mode went to toga; and wouldn't re-engage for the approach. He converted to raw data approach minimum separation between us and aircraft ahead. Failed to accomplish the before landing checklist. After breaking out; the 'too low flaps' warning went off and we executed a go around. Set up and flew an ILS approach to runway 19L and landed fine. Should have gone around sooner when everything started to happen at the same time. ATC crammed us and we should have insisted on re-spacing.

Original NASA ASRS Text

Title: TRAFFIC CONFLICTS AND MALFUNCTIONING NAV SYSTEMS OVERLOAD B737-300 FLT CREW ON APCH. FAIL TO COMPLETE BEFORE LANDING CHECKLIST AND HAVE TO GAR DUE TO LANDING FLAPS NOT SELECTED.

Narrative: ATC SLOWED US TO 160 KTS ON A 20 MI R BASE. ACFT AHEAD BLEW THROUGH FINAL FORCING ATC TO PULL US OFF THE APCH AT APPROX 4 MI OUTSIDE OF OM. AFTER RE-INTERCEPTING FINAL AND GS CAPTURE; CAPT'S AIRSPD INDICATOR BUG FROZE; MODE WENT TO TOGA; AND WOULDN'T RE-ENGAGE FOR THE APCH. HE CONVERTED TO RAW DATA APCH MINIMUM SEPARATION BTWN US AND ACFT AHEAD. FAILED TO ACCOMPLISH THE BEFORE LNDG CHKLIST. AFTER BREAKING OUT; THE 'TOO LOW FLAPS' WARNING WENT OFF AND WE EXECUTED A GAR. SET UP AND FLEW AN ILS APCH TO RWY 19L AND LANDED FINE. SHOULD HAVE GONE AROUND SOONER WHEN EVERYTHING STARTED TO HAPPEN AT THE SAME TIME. ATC CRAMMED US AND WE SHOULD HAVE INSISTED ON RE-SPACING.

Data retrieved from NASA's ASRS site as of January 2009 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.