C525 flight crew reported runway excursion on landing.
Synopsis
C525 flight crew reported runway excursion on landing.
Narrative
Ceilings at ZZZ were reported to be 200 AGL. We as a crew discussed that the wind reported at 160 degrees 8 kts. and with the ILS having a lower ceiling; that Runway X would be better. ATC advised us that an aircraft had just landed a few min prior and to expect XXL. XXL was within operational parameters so we continued to the RNAV via radar vectors. I was acting as the non-flying pilot in the right seat. We are both single pilot type rated and typically fly as such in regards to the pilot in the left seat does pretty much everything except for radio communications and operating the landing gear and flaps. Once we were coupled to the LPV approach; everything seemed normal and I was watching out the window for ground contact; runway environment or approach lights. I do not recall the altitude as my attention was outside and the pilot flying was monitoring the instruments. I am sure that I got the ground; runway lights and end of runway in sight prior to hearing minimums. We did get a too low flaps warning as we were not configured for landing assured at the time. Approach flaps only. I remember us talking about flaps and I selected landing flaps prior to touch down. At this point everything still felt normal. We touched down somewhere near or on the 1000 ft. mark as I remember seeing them out my peripheral vision. I never felt adequate braking from my perspective until we we're probably 100 ft. from the end of runway. Then the Pilot in Command (PIC) realized we're not going to stop in time and I felt what felt like the tires flat spotting. Never felt typical anti-skid operation. We then slid through the end of runway lights and into the grass area. I made a radio call to the effect we were off the end of the runway. Meaning we went off the end. The PIC never stopped and taxied through the grass and back to the runway. Tower said make a left on A to the ramp and I repeated it back. I was a bit shocked at the time we were still taxiing but the PIC insisted on continuing. We taxied to the ramp normally then shut down and let our passengers out and began to gather our thoughts and assess damage. We discovered dents and a hole in the left flap and a dent in the belly just behind the left landing light. I then discussed how to go about reporting this to the PIC and PIC called the chief pilot and I went into the FBO to tend to the passengers. One thing I just realized; we got an unknown master caution on touchdown. This has happened before and maintenance have never found a reason.
Second reporter narrative
While being vectored for the GPS/RNAV Runway XX approach at ZZZ; we were advised that the aircraft before us had landed from the approach. Upon reaching the decision altitude for that approach; we observed the runway lights and continued the approach and touched down just past the one thousand ft. marks on a wet runway. At touchdown; the nonflying pilot deployed the ground flaps; and I started with moderate braking. I also observed that at touchdown; the yellow master caution light and a couple annunciator light flashed briefly. I also observed that the aircraft was not slowing as I normally would have expected; and increased the pressure on the brake pedals. As it became obvious that we were not going to stop or slow enough to turn onto the taxiway; I made a slight turn to miss the threshold lights. Since the airplane did not stop as it rolled into the grass area beyond the threshold; I added power to complete a left turn and return to the pavement. Once on pavement; I tested the brakes; and they worked normally. We then taxied to the ramp area and shut down the engines. It was after deplaning that we discovered that we had hit the lights; and that the left flap had holes in the lower skin. I should note that I never felt the antiskid system working as I was standing on the brakes. The non-flying pilot announced to the Control Tower that we had left the runway. The Controller told us to turn unto the taxiway; and taxi to the ramp.
Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.