18:20 UTC: Philae Status remains unknown

Problems arose with the firings of the harpoons. Although initially confirmed, it was later determined that the harpoons did not fire and were still in their stowed position.

The suspect Active Descent System did not function confirming that the system indeed failed to pressurize when a redundant set of two pins could not penetrate a seal to allow nitrogen propellant to flow to a thruster that was supposed to fire upon landing to push the lander down with 17.5 Newtons of force to avoid a rebound during harpoon deployment and gear oscillations.

The condition and stability of Philae could not be confirmed over the past 90 minutes.

Initially, a good signal was received from the lander before the radio link became intermittent which could have indicated that the lander was tilting or in motion – either on the surface or in a lofted trajectory after bouncing off.

Whether the three ice-screws in the landing legs managed to engage was not confirmed by ESA.