Aircraft was flown at a speed slower than flight planned.

Attributes
ACN	86493
Time
Date	198804
Day	Mon
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : san
State Reference	CA
Altitude	msl bound lower : 29000 msl bound upper : 29000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zla
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 3 Turbojet Eng
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : instrument pilot : atp
Experience	flight time last 90 days : 200 flight time total : 12000 flight time type : 1200
ASRS Report	86493
Person 2
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	non adherence : far non adherence : clearance other anomaly
Independent Detector	other controllera
Resolutory Action	other
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Aircraft had 1 hydraulic system to standby in flight eliminating 1 yaw damper necessitating reduced airspeed and lower altitude than normal stored flight plan. This was an MEL item on large transport re rudder load limiter light on. The flight plan from the company was for the lower altitude. However, center in la questioned our slower than normal speed which made me think maybe the company didn't change the cruise speed on the filed flight plan. The speed was more than 5% less than would normally have been flight planned. After this occurrence, on subsequent frequencys I advised ATC that we were at a reduced speed. Possibly the company should make note on the flight plan that speed change was sent to ATC to preclude a possible flow problem.

Original NASA ASRS Text

Title: ACFT WAS FLOWN AT A SPEED SLOWER THAN FLT PLANNED.

Narrative: ACFT HAD 1 HYD SYS TO STANDBY IN FLT ELIMINATING 1 YAW DAMPER NECESSITATING REDUCED AIRSPD AND LOWER ALT THAN NORMAL STORED FLT PLAN. THIS WAS AN MEL ITEM ON LGT RE RUDDER LOAD LIMITER LIGHT ON. THE FLT PLAN FROM THE COMPANY WAS FOR THE LOWER ALT. HOWEVER, CENTER IN LA QUESTIONED OUR SLOWER THAN NORMAL SPD WHICH MADE ME THINK MAYBE THE COMPANY DIDN'T CHANGE THE CRUISE SPD ON THE FILED FLT PLAN. THE SPD WAS MORE THAN 5% LESS THAN WOULD NORMALLY HAVE BEEN FLT PLANNED. AFTER THIS OCCURRENCE, ON SUBSEQUENT FREQS I ADVISED ATC THAT WE WERE AT A REDUCED SPD. POSSIBLY THE COMPANY SHOULD MAKE NOTE ON THE FLT PLAN THAT SPD CHANGE WAS SENT TO ATC TO PRECLUDE A POSSIBLE FLOW PROB.

Data retrieved from NASA's ASRS site as of August 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.