AN EMB120 OVERSHOOTS ITS ASSIGNED ALT WHEN THE FLC FORGETS TO RESET THEIR ALTIMETERS TO 29 PT 92 WHEN PASSING THROUGH FL180 FOR FL190.

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ON CLBOUT WE WERE CLRED TO FL190. ABOUT 1 MIN AFTER LEVELOFF; THE CTLR (ZOB) SAID HE NEEDED US LEVEL AT FL190 AND TO DSND. INITIALLY I WAS CONFUSED; AS THE ALTIMETER READ FL190; BUT I SOON REALIZED THAT WE HAD NOT SET 29.92 PASSING THROUGH FL180. THE DEP ALTIMETER SETTING AT ZOB WAS 29.46 -- VERY LOW. I IMMEDIATELY DISCONNECTED THE AUTOPLT AND DSNDED BACK FL190. AS WE BEGAN OUR DSCNT; THE TCASII GAVE A TA. CTR HAD AN ACFT AT FL200 AND CLBED THEM TO FL210 AS WE DSNDED. CTR ADVISED US THAT NO MINIMUM SEPARATIONS WERE EXCEEDED AND THAT NO PAPERWORK OR ACTIONS WOULD BE TAKEN. 20 MINS LATER; ANOTHER CTLR ADVISED US TO CALL ZID QUALITY CTL AND WE FOUND OUT THAT THEY HAD INDEED FILED A RPT. FACTORS WERE THE VERY LOW PRESSURE; FORGETTING TO SET 29.92 ON CLBOUT; AND THE CAPT WAS MAKING A PA AS WE PASSED THROUGH FL180. SUPPLEMENTAL INFO FROM ACN 429958: WHILE HE WAS CLBING; I TALKED TO THE PAX ADDRESSING THE TURB AND FLYING CONDITIONS. THE FLT CONDITIONS WERE IMC AND LIGHT TO MODERATE TURB IN THE CLBOUT. WHEN I RETURNED TO COM FREQ #1; I HAD NOTICED THAT MY FO HAD BEGUN A DSCNT AND I HEARD THE VERY END OF A XMISSION FROM A CTLR. A MODIFICATION TO OUR CHKLISTS WOULD BE A GOOD WAY TO RESOLVE THIS MATTER.