G-200 flight crew experienced unsafe main gear indication and right hydraulic overheat EICAS message...

Narrative:

On approach for landing I requested gear down. I was pilot flying; PIC; left seat. Pilot not flying put gear down; we heard gear go down; but gear indications were all three red; not down and locked. We broke off approach and requested holding from tower to troubleshoot. About 20-40 seconds later we got right hydraulic overheat EICAS message. We selected EICAS page 2 to see what the temperature was. Hydraulic temperature indicated 85 and amber. Hydraulic pressure was at 1;400-1;500 psi (normal is 3;000) and this is where it stayed for rest of flight despite checklist procedures. At this point my co-pilot started reading the checklist for right hydraulic overheat. Part of this checklist is 'reduce right engine to idle.' I did this and that is where it remained for duration of flight. At this point we discussed going to an airport with a longer runway due to multiple issues; especially considering they were gear and hydraulic issues. ZZZ was very close; so we decided on that. As per QRH; I blew the gear down with emergency blow down bottle. Results were now nose gear green; but mains remained red. We requested flyby of the tower to see if they saw our gear down. They said they could see all three down. We then declared an emergency. At some point my co-pilot turned around and told the passengers what was going on and warned of possible gear collapse. Enroute I requested right hydraulic failure checklist for guidance since hydraulic temperature was still amber (though it fluctuated from normal temps to amber temps with continual on/off of right hydraulic overheat message). Also; pressure stayed at 1;400-1;500 psi. Among other things the checklist advised of longer landing distances. As per QRH I selected emergency brakes on short final. On landing I felt an unusual sort of braking and the plane felt different then I've felt before; though for a few seconds it remained level. After two to three seconds; it started tilting to the right; almost in slow motion. My main objective at this point was to settle the plane down on the wing gently if possible while trying to maintain centerline. At this point the plane settled on its right wing and slowed/slid to a stop.

Original NASA ASRS Text

Title: G-200 flight crew experienced unsafe main gear indication and Right Hydraulic Overheat EICAS message. Tower advised a visual indication of gear down; but on landing rollout right main collapsed and the right wing contacted the ground. There was no fire and uneventful evacuation followed.

Narrative: On approach for landing I requested gear down. I was pilot flying; PIC; left seat. Pilot not flying put gear down; we heard gear go down; but gear indications were all three red; not down and locked. We broke off approach and requested holding from Tower to troubleshoot. About 20-40 seconds later we got R HYD OVERHEAT EICAS message. We selected EICAS Page 2 to see what the temperature was. Hydraulic temperature indicated 85 and Amber. Hydraulic pressure was at 1;400-1;500 PSI (normal is 3;000) and this is where it stayed for rest of flight despite checklist procedures. At this point my co-pilot started reading the checklist for Right Hydraulic Overheat. Part of this checklist is 'reduce right engine to idle.' I did this and that is where it remained for duration of flight. At this point we discussed going to an airport with a longer runway due to multiple issues; especially considering they were gear and hydraulic issues. ZZZ was very close; so we decided on that. As per QRH; I blew the gear down with emergency blow down bottle. Results were now nose gear green; but mains remained red. We requested flyby of the Tower to see if they saw our gear down. They said they could see all three down. We then declared an emergency. At some point my co-pilot turned around and told the passengers what was going on and warned of possible gear collapse. Enroute I requested right Hydraulic Failure Checklist for guidance since hydraulic temperature was still amber (though it fluctuated from normal temps to amber temps with continual on/off of R HYD overheat message). Also; pressure stayed at 1;400-1;500 PSI. Among other things the checklist advised of longer landing distances. As per QRH I selected emergency brakes on short final. On landing I felt an unusual sort of braking and the plane felt different then I've felt before; though for a few seconds it remained level. After two to three seconds; it started tilting to the right; almost in slow motion. My main objective at this point was to settle the plane down on the wing gently if possible while trying to maintain centerline. At this point the plane settled on its right wing and slowed/slid to a stop.

Data retrieved from NASA's ASRS site as of April 2012 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.

Attributes
ACN	950957
Time
Date	201105
Local Time Of Day	ZZZ
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Gulfstream G200 (IAI 1126 Galaxy)
Operating Under FAR Part	Part 91
Flight Phase	Initial Approach
Component
Aircraft Component	Main Gear
Person 1
Function	Captain Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Person 2
Function	Pilot Not Flying Captain
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Aircraft Equipment Problem Critical Ground Event / Encounter Ground Strike - Aircraft

G-200 flight crew experienced unsafe main gear indication and right hydraulic overheat EICAS message. Tower advised a visual indication of gear down; but on landing rollout right main collapsed and the right wing contacted the ground. There was no fire and uneventful evacuation followed.