A cargo handling system for restraining a unit load device comprising: a structural channel having a hollow interior; at least one locking mechanism associated with said structural channel, the locking mechanism being movable to engage the unit load device wherein the locking mechanism includes a first, outer pawl rotatable about an axis defined by a first pin and a second, inner pawl rotatable about an axis defined by a second pin pm; and a motor assembly coupled to the second pin and to the at least one locking mechanism, the motor assembly being operable to automatically move the at least one locking mechanism upon detection of the unit load device at or approaching a desired position adjacent the at least one locking mechanism, wherein the motor assembly further comprises: a housing assembly coupled the structural channel; a drive mechanism positioned within the housing assembly; and a rotatable shaft associated with the drive mechanism, the shaft being coupled to the second pin, wherein the shaft is arranged coaxially with the second pin; wherein the drive mechanism is movable relative to the housing assembly to selectively decouple the shaft from the second pin; and wherein the motor assembly further comprises: a lever coupled to the drive mechanism, a portion of the lever extending outside of the housing assembly; and a biasing mechanism disposed within the housing assembly adjacent the drive mechanism, wherein a biasing force of the biasing mechanism biases the shaft into engagement with the second pin. a structural channel having a hollow interior; at least one locking mechanism associated with said structural channel, the locking mechanism being movable to engage the unit load device wherein the locking mechanism includes a first, outer pawl rotatable about an axis defined by a first pin and a second, inner pawl rotatable about an axis defined by a second pin pm; and a motor assembly coupled to the second pin and to the at least one locking mechanism, the motor assembly being operable to automatically move the at least one locking mechanism upon detection of the unit load device at or approaching a desired position adjacent the at least one locking mechanism, wherein the motor assembly further comprises: a housing assembly coupled the structural channel; a drive mechanism positioned within the housing assembly; and a housing assembly coupled the structural channel; a drive mechanism positioned within the housing assembly; and a rotatable shaft associated with the drive mechanism, the shaft being coupled to the second pin, wherein the shaft is arranged coaxially with the second pin; wherein the drive mechanism is movable relative to the housing assembly to selectively decouple the shaft from the second pin; and wherein the motor assembly further comprises: a lever coupled to the drive mechanism, a portion of the lever extending outside of the housing assembly; and a biasing mechanism disposed within the housing assembly adjacent the drive mechanism, wherein a biasing force of the biasing mechanism biases the shaft into engagement with the second pin. a lever coupled to the drive mechanism, a portion of the lever extending outside of the housing assembly; and a biasing mechanism disposed within the housing assembly adjacent the drive mechanism, wherein a biasing force of the biasing mechanism biases the shaft into engagement with the second pin.