An embraer 120 on approach at 1000 ft AGL declared an emergency and made missed approach due to elec...

Attributes
ACN	446549
Time
Date	199908
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : cle.airport
State Reference	OH
Altitude	agl single value : 1000
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : cle.tracon
Operator	common carrier : air carrier
Make Model Name	Brasilia EMB-120 All Series
Operating Under FAR Part	Part 135
Navigation In Use	ils localizer & glide slope : 5r
Flight Phase	landing : missed approach
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : instrument pilot : commercial
Experience	flight time last 90 days : 140 flight time total : 1150 flight time type : 140
ASRS Report	446549
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	aircraft equipment other aircraft equipment : gear unsafe warning other flight crewa other flight crewb
Resolutory Action	flight crew : declared emergency flight crew : landed in emergency condition
Consequence	other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

On ILS runway 5R cle in IMC, multiple warning on missed approach and area warnings began. First officer radio became useless, gear indicated up, or not down and locked. Did go around, missed approach, contacted ATC (captain), flew to 4000 ft MSL runway heading. Lost T6 and torque gauges. Contacted maintenance (captain). Did emergency gear extend procedure after giving plane to captain. Completed checklist and gear indicated down, but not locked. Did fly-by and tower said gear looked down. Then proceeded to do visual to runway 5R, before landing checklist, and landed uneventfully on runway 5R. No injuries, no incidents. Problem occurred due to massive electrical system failure causing multiple component failures. EFIS, instruments, radios, and gear indications. Corrective action was focusing on main problem/gear down and landing safely, keeping communication active in a difficult, loud environment, even when indications were that there were several failures at one time. Callback conversation with reporter revealed the following information: the reporter stated the circuit breaker that failed supplied power to the first officer's radios, flight instruments, #2 engine indications and landing gear indication and control. The reporter claims the circuit breaker was located behind a panel on the captain's side and was not accessible to the crew.

Original NASA ASRS Text

Title: AN EMBRAER 120 ON APCH AT 1000 FT AGL DECLARED AN EMER AND MADE MISSED APCH DUE TO ELECTRICAL BUS PWR FAILURE CAUSED BY A FAILED CIRCUIT BREAKER.

Narrative: ON ILS RWY 5R CLE IN IMC, MULTIPLE WARNING ON MISSED APCH AND AREA WARNINGS BEGAN. FO RADIO BECAME USELESS, GEAR INDICATED UP, OR NOT DOWN AND LOCKED. DID GAR, MISSED APCH, CONTACTED ATC (CAPT), FLEW TO 4000 FT MSL RWY HDG. LOST T6 AND TORQUE GAUGES. CONTACTED MAINT (CAPT). DID EMER GEAR EXTEND PROC AFTER GIVING PLANE TO CAPT. COMPLETED CHKLIST AND GEAR INDICATED DOWN, BUT NOT LOCKED. DID FLY-BY AND TWR SAID GEAR LOOKED DOWN. THEN PROCEEDED TO DO VISUAL TO RWY 5R, BEFORE LNDG CHKLIST, AND LANDED UNEVENTFULLY ON RWY 5R. NO INJURIES, NO INCIDENTS. PROB OCCURRED DUE TO MASSIVE ELECTRICAL SYS FAILURE CAUSING MULTIPLE COMPONENT FAILURES. EFIS, INSTS, RADIOS, AND GEAR INDICATIONS. CORRECTIVE ACTION WAS FOCUSING ON MAIN PROB/GEAR DOWN AND LNDG SAFELY, KEEPING COM ACTIVE IN A DIFFICULT, LOUD ENVIRONMENT, EVEN WHEN INDICATIONS WERE THAT THERE WERE SEVERAL FAILURES AT ONE TIME. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE CIRCUIT BREAKER THAT FAILED SUPPLIED PWR TO THE FO'S RADIOS, FLT INSTS, #2 ENG INDICATIONS AND LNDG GEAR INDICATION AND CTL. THE RPTR CLAIMS THE CIRCUIT BREAKER WAS LOCATED BEHIND A PANEL ON THE CAPT'S SIDE AND WAS NOT ACCESSIBLE TO THE CREW.

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.

An embraer 120 on approach at 1000 ft AGL declared an emergency and made missed approach due to electrical bus power failure caused by a failed circuit breaker.