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AD/B737/301 Amdt 2 - Spoiler Actuator Jamming

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Boeing 737 Series Aeroplanes

AD/B737/301 Amdt 2	Spoiler Actuator Jamming	11/2007

Applicability:	Model 737-800 series aeroplanes, serial numbers 32685, 34277 through 34281 inclusive, 34474, 34475, 34654 through 34656 inclusive, 34690, 34948, 34949, 35091 through 35093 inclusive, 35103, 35134, 35176 through 35183 inclusive, 35330, 35331, 35558, 35559, and 36323 through 36328 inclusive.
Requirement:	1. Visually check the spoilers to determine spoiler position, in accordance with Boeing 737 Flight Crew Operations Manual Bulletin No. TBC-67, dated5 March 2007. If all spoilers are determined to be properly stowed, no further action is necessary in accordance with this Requirement.
	The visual checks may be performed by qualified personnel or flight crew and must be entered into the aircraft records showing compliance with this AD.
	2. If, during the Requirement 1 visual check, any spoiler is found to be improperly stowed (in the up position with the speedbrake handle in the down position), replace the flight spoiler actuator with a flight spoiler actuator, having part number (P/N) P665A0001-01 or higher dash number, in accordance with a method approved by the Manager, Seattle Aircraft Certification Office (ACO), United States Federal Aviation Administration (FAA).
	The "Flight Spoiler Actuator Removal” task and the "Flight Spoiler Actuator Installation” task in Chapter 27-61-51 of the 737/600/700/800/900 Aircraft Maintenance Manual (AMM) are approved methods for the replacement (removal and installation) of the flight spoiler actuator.
	3. Carry out an operational test of the speedbrake control system in accordance with a method approved by the Manager, Seattle ACO.
	The "Speedbrake Control System Operational Test” specified in Chapter27-62-00 of the 737/600/700/800/900 AMM is one approved method for the operational test of the speedbrake control system.
	Note 1: The optional installation of flight spoiler actuator, P/N P665A0001-01 or higher dash number, in all eight flight spoiler positions ends the need for the Requirement 1 repetitive visual checks and the Requirement 3 operational checks.

	4. If, during the Requirement 3 operational test, any spoiler panel is found to be fully extended with the speedbrake handle down, or if any spoiler panel is found fully retracted when the speedbrake handle is up, replace the flight spoiler actuator in accordance with the actions specified in Requirement 2.

	For Requirement 3 - After any maintenance action that operates the spoiler system, until the installation of flight spoiler actuator, P/N P665A0001-01 or higher dash number, in all eight flight spoiler positions is accomplished.
	For Requirement 4 - Before further flight after the Requirement 3 operational test.
	For Requirement 5 and 6 - As of the effective date of this AD.
	For Requirement 7:
	a. For visual checks accomplished before the effective date of this AD - Within seven days after effective date of this AD.
	b. For visual checks accomplished after the effective date of this AD - Within seven days after carrying out the inspection.
	For Requirement 8 - Within 120 days after the effective date of this AD.
	For Requirement 9 - As of the effective date of this AD.
	This Amendment becomes effective on 25 October 2007.
Background:	The United States federal Aviation Administration (FAA) has received a report of seven flight spoiler actuator jams on Model 737-800 Short Field Performance (SFP) aeroplanes. The cause of the failure has been identified as interference within the actuator main control valve.
	The original issue of this is Directive was issued to detect and correct any spoiler panel that is found in the up position with the speedbrake handle in the down position, which could result in a spoiler actuator hardover and could cause the spoiler surface to jam in the fully extended position. Two or more hardover failures of the spoiler surfaces in the up direction on the same wing, if undetected prior to takeoff, can cause significant roll and consequent loss of control of the aeroplane.
	Amendment 1 was issued following advice from the FAA that the incorrect spoiler actuator part numbers were inadvertently used in AD 2007-06-51 and were corrected in AD 2007-06-52. These part number corrections were incorporated in Amendment 1.
	This amendment introduces a requirement to replace all flight spoilers with those of a higher dash number which is intended to eliminate the possibility of the unsafe condition occurring.The replacement of all flight spoiler actuators provides a terminating action to the requirements of this AD.