A B737 FLIGHT CREW PERFORMING A FUNCTIONAL TEST FLIGHT TO CHECK FOR SMOKE; NOTICES INSTANTANEOUS AND LARGE AMOUNTS OF SMOKE FILLED THE COCKPIT AND CABIN AFTER INITIAL DEPLOYMENT OF THRUST REVERSERS.

Narrative

FLEW ACFT FOR FUNCTIONAL CHK FLT TO CHK FOR SMOKE. ON LNDG AFTER TOUCHDOWN AND INITIAL DEPLOYMENT OF THRUST REVERSERS; SMOKE FILLED THE COCKPIT AND CABIN. INSTANTANEOUS AND LARGE AMOUNTS OF SMOKE. DIFFICULTY SEEING OTHER CREW MEMBER. STOWED THRUST REVERSERS; OPENED WINDOWS AND PUT ON OXYGEN MASK. SMOKE DISSIPATED AFTER APPROX 30-60 SECONDS. NO ADDITIONAL SMOKE ON TAXI IN. COMPANY ENGINEER WAS IN CABIN AS OBSERVER AND SAW SMOKE ON FLOOR AFTER LNDG AND LOOKED AFT TO SEE A WALL OF SMOKE MOVING FORWARD IN CABIN. AT HANGAR; DEBRIEFED COPLT AND OBSERVER. SUGGESTED THEY CONTACT A DOCTOR FOR SMOKE INHALATION. OXYGEN MASKS WERE PUT ON RAPIDLY AND NO CREW MEMBER REQUESTED ASSISTANCE. THIS WAS A TEST FLT. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: REPORTER STATED THERE WAS A SWEET SMELL OF SOME TYPE OF FLUID; OR OIL; THAT HAPPENED ALONG WITH THE SMOKE; WHEN GOING INTO REVERSE THRUST ON THE B737 ACFT. MAINT ORIGINALLY THOUGHT A 5TH STAGE CLAMP ON THE CFM-56 ENGINE WAS CONTRIBUTING TO THE PROBLEM. REPORTER STATED THE #1 ENGINE WAS CHANGED FOR THE SMOKE ISSUE PRIOR TO HIS FUNCTIONAL TEST FLIGHT; BUT THE SAME COCKPIT AND CABIN SMOKE CONDITION REAPPEARED DURING HIS FLIGHT TEST. REPORTER ALSO STATED THE PROBLEM SEEMS MORE ASSOCIATED WITH THE LEFT AIR CONDITIONING PACK. THIS WAS HIS THIRD ACFT WITH SMOKE ISSUES IN THE COCKPIT AND CABIN.