PA-28 Cherokee/Archer/Dakota/Pillan/Warrior
Flight Crew Instrument; Flight Crew Private
Flight Crew Last 90 Days 5.5; Flight Crew Total 966; Flight Crew Type 32
Situational Awareness
Conflict NMAC
General None Reported / Taken
Human Factors
Westbound out of PWK at an initial cruising altitude of 1;800 MSL I was following a Cessna 172 that was also heading west at a higher altitude. The Cessna decided to descend to a lower altitude (he reported reaching 1;700 MSL) and as my aircraft was significantly faster I later overtook the Cessna with just a 100 FT vertical separation and minimal horizontal separation. I should have observed the standard overtaking procedure of passing to the right of the Cessna with adequate horizontal clearance.
The pilot of a VFR PA-28 failed to take appropriate corrective action when overtaking a Cessna 172 and passed just 100 FT over the Cessna.