An MD80 on 3 mi final at 1000 ft had nose landing gear fail to extend. Extended on go around but inc...

Attributes
ACN	521811
Time
Date	200108
Day	Wed
Place
Locale Reference	airport : ord.airport
State Reference	IL
Altitude	agl single value : 1000
Aircraft 1
Controlling Facilities	tower : ord.tower tower : sna.tower
Operator	common carrier : air carrier
Make Model Name	MD-80 Super 80
Operating Under FAR Part	Part 121
Flight Phase	descent : approach landing : go around
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	521811
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : hyd. press and qty ind other flight crewa other flight crewb
Resolutory Action	controller : issued new clearance flight crew : executed go around
Consequence	other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

On final for runway 4R at ord, first officer was flying, and asked for gear down. I lowered the handle, but the gear did not come down. I checked hydraulic switches in the on high/high/on. After a few seconds, the main gear both came down 'green' but the nose gear still indicated unsafe. Right hydraulic quantity was near zero, but pressure was near normal though it was unsteady. With no safe nose gear indication we went around. During the go around, the nose gear came down and indicated safe. We left the gear down. The right hydraulic quantity was still near zero, but the pressure was now stable and normal. The left system operated normally throughout. We landed normally. Since our gate was occupied, ground sent us to runway 32R pad. As soon as I parked the brakes, an employee in the back said he heard a grinding sound near the right engine. I decided to turn off the hydraulics to the right system. I then requested that maintenance come out and pin the gear with no pressure on the gear. We then taxied in normally. Callback conversation with reporter revealed the following information: the reporter stated the exact component that caused the loss of fluid and pressure is unknown. The reporter said maintenance has not advised the crew of the maintenance action taken.

Original NASA ASRS Text

Title: AN MD80 ON 3 MI FINAL AT 1000 FT HAD NOSE LNDG GEAR FAIL TO EXTEND. EXTENDED ON GAR BUT INCURRED LOSS OF R HYD SYS. CAUSE UNKNOWN.

Narrative: ON FINAL FOR RWY 4R AT ORD, FO WAS FLYING, AND ASKED FOR GEAR DOWN. I LOWERED THE HANDLE, BUT THE GEAR DID NOT COME DOWN. I CHKED HYD SWITCHES IN THE ON HIGH/HIGH/ON. AFTER A FEW SECONDS, THE MAIN GEAR BOTH CAME DOWN 'GREEN' BUT THE NOSE GEAR STILL INDICATED UNSAFE. R HYD QUANTITY WAS NEAR ZERO, BUT PRESSURE WAS NEAR NORMAL THOUGH IT WAS UNSTEADY. WITH NO SAFE NOSE GEAR INDICATION WE WENT AROUND. DURING THE GAR, THE NOSE GEAR CAME DOWN AND INDICATED SAFE. WE LEFT THE GEAR DOWN. THE R HYD QUANTITY WAS STILL NEAR ZERO, BUT THE PRESSURE WAS NOW STABLE AND NORMAL. THE L SYS OPERATED NORMALLY THROUGHOUT. WE LANDED NORMALLY. SINCE OUR GATE WAS OCCUPIED, GND SENT US TO RWY 32R PAD. AS SOON AS I PARKED THE BRAKES, AN EMPLOYEE IN THE BACK SAID HE HEARD A GRINDING SOUND NEAR THE R ENG. I DECIDED TO TURN OFF THE HYDS TO THE R SYS. I THEN REQUESTED THAT MAINT COME OUT AND PIN THE GEAR WITH NO PRESSURE ON THE GEAR. WE THEN TAXIED IN NORMALLY. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE EXACT COMPONENT THAT CAUSED THE LOSS OF FLUID AND PRESSURE IS UNKNOWN. THE RPTR SAID MAINT HAS NOT ADVISED THE CREW OF THE MAINT ACTION TAKEN.

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 MD80 on 3 mi final at 1000 ft had nose landing gear fail to extend. Extended on go around but incurred loss of right hydraulic system. Cause unknown.