Narrative:

Being radar vectored from en route phase to join localizer. Assigned 060 degrees at 4000' to join published inbound localizer 128 degree course at 2200'. IMC conditions with light to moderate chop. During scan noticed altitude los of 200'. Had been instructed by ATC 160 KTS. Aircraft did not respond to correction of altitude immediately due to slow speed. Conditions continued to deteriorate (speed and altitude) until at 140 KTS and 3500'. ATC politely reiterated altitude assigned was 4000' and asked for present altitude. Captain replied. Altitude deviation quickly corrected by first officer. Localizer intercepted and approach completed west/O incident. Very new first officer with low time. Perhaps 80 hours in type sic but only 20-25 hours at controls. Due to instrumentation, first officer must use captain's altimeter for accuracy (first officer's not corrected for temperature). Also, first officer's yoke severely hinders view of his own G/south indicators. Therefore a proficient scan of instruments, both the captain's and first officer's is necessary. The first officer's lack of experience in this technique as well as making a late and insufficient response to the initial altitude/speed loss prompted further altitude and speed problems. First officer initial action too late and too little. First officer scan insufficient at time of occurrence. Captain and first officer discussed the events leading up to deviation and concluded that first officer should have asked for flaps 10 degrees to prevent aircraft from becoming unresponsive (back side of power curve) during the slow speed maneuvering. First officer should have taken corrective action sooner and with more authority. First officer must adapt his scan to accommodate equipment.

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Original NASA ASRS Text

Title: SMT JET EXCURSIONED FROM 4000' ASSIGNED ALT ON VECTOR TO APCH BFI.

Narrative: BEING RADAR VECTORED FROM ENRTE PHASE TO JOIN LOC. ASSIGNED 060 DEGS AT 4000' TO JOIN PUBLISHED INBND LOC 128 DEG COURSE AT 2200'. IMC CONDITIONS WITH LIGHT TO MODERATE CHOP. DURING SCAN NOTICED ALT LOS OF 200'. HAD BEEN INSTRUCTED BY ATC 160 KTS. ACFT DID NOT RESPOND TO CORRECTION OF ALT IMMEDIATELY DUE TO SLOW SPD. CONDITIONS CONTINUED TO DETERIORATE (SPD AND ALT) UNTIL AT 140 KTS AND 3500'. ATC POLITELY REITERATED ALT ASSIGNED WAS 4000' AND ASKED FOR PRESENT ALT. CAPT REPLIED. ALT DEVIATION QUICKLY CORRECTED BY F/O. LOC INTERCEPTED AND APCH COMPLETED W/O INCIDENT. VERY NEW F/O WITH LOW TIME. PERHAPS 80 HRS IN TYPE SIC BUT ONLY 20-25 HRS AT CTLS. DUE TO INSTRUMENTATION, F/O MUST USE CAPT'S ALTIMETER FOR ACCURACY (F/O'S NOT CORRECTED FOR TEMP). ALSO, F/O'S YOKE SEVERELY HINDERS VIEW OF HIS OWN G/S INDICATORS. THEREFORE A PROFICIENT SCAN OF INSTRUMENTS, BOTH THE CAPT'S AND F/O'S IS NECESSARY. THE F/O'S LACK OF EXPERIENCE IN THIS TECHNIQUE AS WELL AS MAKING A LATE AND INSUFFICIENT RESPONSE TO THE INITIAL ALT/SPD LOSS PROMPTED FURTHER ALT AND SPD PROBS. F/O INITIAL ACTION TOO LATE AND TOO LITTLE. F/O SCAN INSUFFICIENT AT TIME OF OCCURRENCE. CAPT AND F/O DISCUSSED THE EVENTS LEADING UP TO DEVIATION AND CONCLUDED THAT F/O SHOULD HAVE ASKED FOR FLAPS 10 DEGS TO PREVENT ACFT FROM BECOMING UNRESPONSIVE (BACK SIDE OF PWR CURVE) DURING THE SLOW SPD MANEUVERING. F/O SHOULD HAVE TAKEN CORRECTIVE ACTION SOONER AND WITH MORE AUTHORITY. F/O MUST ADAPT HIS SCAN TO ACCOMMODATE EQUIPMENT.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.